NGUYN T - BNG TUN HON CC NGUYN T HA HC Bi 1. Bit nguyn t C c khi lng bng 1,9926. 1023 g. Tnh khi lng bng gam ca nguyn t natri. Bit nguyn t khi ca natri l 23 vC Bi 2. Nguyn t khi ca nguyn t C bng 3/4 nguyn t khi ca nguyn t O, nguyn t khi ca nguyn t O bng 1/2 nguyn t khi ca nguyn t S. Tnh khi lng ca nguyn t O v S. Bi 3. Nguyn t ca nguyn t X nng 6,6553. 1023 g. Hi X l nguyn t no? Bi 4. Bit rng 4 nguyn t magie nng bng 3 nguyn t nguyn t X. Xc nh tn v k hiu ha hc ca nguyn t X Bi 5. a. Nguyn t X nng gp hai ln nguyn t oxi. b. Nguyn t Y nh hn nguyn t magie 0,5 ln. c. Nguyn t Z nng hn nguyn t natri l 17 vC. Hy tnh nguyn t khi ca X, Y, Z, tn nguyn t v k hiu ho hc ca cc nguyn t ? Bi 6. Nguyn t M c s n nhiu hn s p l 1 v s ht mang in nhiu hn s ht khng mang in l 10. Hy xc nh M l nguyn t no? Bi 7. Tng s ht p, e v n trong nguyn t l 28, trong s ht khng mang in chim xp x 35%. Tnh s ht mi loi Bi 8. Nguyn t st c 26p, 30n, 26e a. Tnh khi lng nguyn t st b. Tnh khi lng e trong 1kg st Bi 9. Nguyn t X c tng cc ht l 52 trong s ht mang in nhiu hn s ht khng mang in l 16 ht. a. Hy xc nh s p, s n v s e trong nguyn t X. b. V s nguyn t X. c. Hy vit tn, k hiu ho hc v nguyn t khi ca nguyn t X. Bi 10. Mt nguyn t X c tng s ht e, p, n l 34. S ht mang in nhiu hn s ht khng mang in l 10. Tm tn nguyn t X. V s cu to ca nguyn t X v ion c to ra t nguyn t X. Bi 11. Mt nguyn t X c tng s ht l 46, s ht khng mang in bng8 s ht mang 15

in. Xc nh nguyn t X thuc nguyn t no v v s cu to nguyn t X? Bi 12. Nguyn t Z c tng s ht bng 58 v c nguyn t khi < 40. Hi Z thuc nguyn t ho hc no. V s cu to nguyn t ca nguyn t Z? Cho bit Z l kim loi hay phi kim? Bi 13. Tm 2 nguyn t A, B trong cc trng hp sau y : a. Bit A, B ng k tip trong mt chu k ca bng tun hon v c tng s in tch ht nhn l 25. b. A, B thuc 2 chu k k tip v cng mt phn nhm chnh trong bng tun hon. Tng s in tch ht nhn l 32. Bi 14. Tng s ht p, n v e ca nguyn t nguyn t X l 82 ht. S ht mang in nhiu hn s ht khng mang in l 22 ht. X l nguyn t no? Bi 15. Nguyn t ca nguyn t R c tng s ht proton, ntron v electron l 40. Trong s ht mang in nhiu hn s ht khng mang in l 12. Xc nh R v s ht mi loi. Bi 16. Nguyn t X c ba lp electron k hiu l 2/8/3. - Xc nh tn ca nguyn t X.

- t nng X nhit cao trong khng kh. Vit cc phng trnh phn ng ha hc xy ra (gi s khng kh ch gm N2 v O2). Bi 17. Tng s ht proton, ntron v electron trong ion X 3+ l 79 ht, trong tng s ht mang in nhiu hn tng s ht khng mang in l 19 ht. Xc nh nguyn t X. Bi 18. Tng s ht proton, ntron v electron trong ion X 2 l 26 ht, trong tng s ht mang in nhiu hn tng s ht khng mang in l 10 ht. Xc nh nguyn t X. Bi 19. Tng s ht proton, ntron v electron trong hai nguyn t kim loi A v B l 142, trong tng s ht mang in nhiu hn tng s ht khng mang in l 42. Tng s ht mang in ca nguyn t B nhiu hn tng s ht mang in ca nguyn t A l 12. Xc nh 2 kim loi A v B. Bi 20. Tng s ht proton, ntron v electron trong hai nguyn t phi kim X v Y l 76, trong tng s ht mang in nhiu hn tng s ht khng mang in l 24. Tng s ht mang in ca nguyn t Y nhiu hn tng s ht mang in ca nguyn t X l 18. Xc nh 2 kim loi X v Y. Bi 21. Cho bit tng s ht proton, ntron, electron trong 2 nguyn t ca nguyn t A v B l 78, trong tng s ht mang in nhiu hn tng s ht khng mang in l 26 ht. Tng s ht mang in ca A nhiu hn tng s ht mang in ca B l 28 ht. Hi A, B l nguyn t no? Cho bit in tch ht nhn ca mt s nguyn t sau: ZN = 7; ZNa = 11; ZCa = 20; ZFe = 26; ZCu = 29; ZC = 6; ZS = 16. Bi 22. C hp cht MX3. Cho bit: a. Tng s ht proton, ntron, electron l 196, trong tng s ht mang in nhiu hn tng s ht khng mang in l 60, khi lng nguyn t ca X ln hn ca M l 8. b. Tng 3 loi ht trn trong ion X nhiu hn trong ion M 3+ l 16. Xc nh cng thc phn t ca hp cht MX3. Bi 23. C hp cht M2X3. Cho bit: a. Tng s ht proton, ntron, electron l 212, trong tng s ht mang in nhiu hn tng s ht khng mang in l 68, khi lng nguyn t ca X ln hn ca M l 40. b. Tng 3 loi ht trn trong ion M 3+ nhiu hn trong ion X 2 l 53. Xc nh cng thc phn t ca hp cht M2X3. 2 Bi 24. Tng s ht mang in trong ion AB3 bng 82 ht. S ht mang in trong ht nhn ca nguyn t A nhiu hn s ht mang in trong ht nhn nguyn t B l 16 ht. Xc nh A v B. 3 Bi 25. Tng s ht mang in trong ion XY 4 bng 97 ht. S ht mang in trong ht nhn ca nguyn t X nhiu hn s ht mang in trong ht nhn nguyn t Y l 14 ht. Xc nh X v Y. + Bi 26. Tng s ht mang in trong ion XY 4 bng 21 ht. S ht mang in trong ht nhn ca nguyn t X nhiu hn s ht mang in trong ht nhn nguyn t Y l 6 ht. Xc nh X v Y. Bi 27. Tng s ht mang in trong ion A 2B2 bng 208 ht. S ht mang in trong ht nhn 7 ca nguyn t A nhiu hn s ht mang in trong ht nhn nguyn t B l 32 ht. Xc nh A v B. PHN NG HA HC Hon thnh cc phng trnh phn ng sau: to 1. FeS2 + O2 SO2 + Fe2O3.

t 2. Fe(OH)3 Fe2O3 + H2O 3. SO2 + H2S S + H2O to 4. Fe2O3 + H2 Fe3O4 + H2O 5. FeS + HCl FeCl2 + H2S 6. Fe(OH)2 + O2 + H2O Fe(OH)3 7. FeCl2 + NaOH Fe(OH)2 + NaCl 8. MnO2 + HBr Br2 + MnBr2 + H2O. 9. Cl2 + SO2 + H2O HCl + H2SO4. 10. Ca(OH)2 + NH4NO3 NH3 + Ca(NO3)2 + H2O. 11. Ca(H2PO4)2 + Ca(OH)2 Ca3(PO4)2 + H2O. 12. CxHy(COOH)2 + O2 CO2 + H2O. 13. KHCO3 + Ca(OH)2(d) K2CO3 + CaCO3 + H2O 14. Al2O3 + KHSO4 Al2(SO4)3 + K2SO4 + H2O. to 15. Fe2O3 + H2 FexOy + H2O. 16. NaHSO4 + BaCO3 Na2SO4 + BaSO4 + CO2 + H2O. to 17. H2SO4 + Fe Fe2(SO4)3 + SO2 + H2O. t 18. H2SO4 + Ag Ag2SO4 + SO2 + H2O. 19. Ba(HCO3)2 + Ca(OH)2 BaCO3 + CaCO3 + H2O. 20. Fe2O3 + HNO3 Fe(NO3)2 + H2O t 21. FexOy + O2 Fe2O3. 22. MnO2 + HCl MnCl2 + Cl2 + H2O. n ph i n 23. NaCl + H2O NaOH + Cl2 + H2. c m ngn xp ng 24. KMnO4 + HCl KCl + MnCl2 + Cl2 + H2O. 25. KMnO4 + NaCl + H2SO4 Cl2 + H2O + K2SO4 + Na2SO4 + MnSO4. 26. Fe3O4 + HCl FeCl2 + FeCl3 + H2O. to 27. FeS2 + O2 Fe2O3 + SO2. o

o

o

t 28. Cu + H2SO4(c) CuSO4 + SO2 + H2O. to 29. FexOy + CO FeO + CO2. t 30. FexOy + Al Fe + Al2O3. to 31. FexOy + H2SO4 Fe2(SO4)3 + SO2 + H2O t H2 Fe + H2O to 33. Al(NO3)3 Al2O3 + NO2 + O2 34. FeSO4 + H2SO4 + KMnO4 Fe2(SO4)3 + K2SO4 + MnSO4 + H2O 35. KMnO4 + K2SO3 + H2O MnO2 + K2SO4 + KOH 36. SO2 + KMnO4 + H2O MnSO4 + K2SO4 + H2SO4 37. K2Cr2O7 + H2S + H2SO4 Cr2(SO4)3 + K2SO4 + S + H2O 38. K2Cr2O7 + HBr CrBr3 + KBr + Br2 + H2O 39. K2Cr2O7 + HCl CrCl3 + KCl + Cl2 + H2O 40. K2Cr2O7 + SO2 + H2SO4 Cr2(SO4)3 + K2SO4 + H2O 41. S + HNO3 H2SO4 + NO2 + H2O 42. P + H2SO4 H3PO4 + SO2 + H2O 43. Fe3O4 + HNO3 Fe(NO3)3 + NO + H2O 44. Al + HNO3(rt long) Al(NO3)3 + N2 + H2Oo

o

32. FexOy +

o

45. Al + HNO3(rt long) Al(NO3)3 + NH4NO3 + H2O LP CNG THC HA HC Bi 1. Tnh thnh phn phn trm theo khi lng ca cc nguyn t c trong cc hp cht sau: a. H2O b. H2SO4 c. Ca3(PO4)2 Bi 2. Tnh thnh phn phn trm theo khi lng ca cc nguyn t c trong cc hp cht sau: a. CO; FeS2; CO2; C2H4; C6H6. b. FeO; Fe3O4; Fe2O3; Fe(OH)2; Fe(OH)3. c. CuSO4; CaCO3; K3PO4; H2SO4; HNO3; Na2CO3. d. Zn(OH)2; Al2(SO4)3; Fe(NO3)3; (NH4)2SO4; Fe2(SO4)3. Bi 3. Trong cc hp cht sau, hp cht no c hm lng Fe cao nht: FeO; Fe 2O3; Fe3O4; Fe(OH)3; FeCl2 ; FeSO4.5H2O ? Bi 4. Trong cc loi phn bn sau, loi phn bn no c hm lng N cao nht: NH4NO3; NH4Cl; (NH4)2SO4; KNO3; (NH2)2CO? Bi 5. Tnh khi lng ca nguyn t Oxi c trong mi lng hp cht sau: 1. 18 gam nc. 2. 2,2 gam CO2 3. 8 gam CuSO4 4. 2 gam Fe2(SO4)3 Bi 6. Tm s mol nguyn t ca mi nguyn t c trong: 1. 17 gam NH3 2. 1,7 gam AgNO3 3. 13,2 gam (NH4)2SO4 4. 2,94 gam K2Cr2O7 Bi 7. Mt ngi lm vn dng 500g (NH4)2SO4 bn rau. Tnh khi lng N bn cho rau? Bi 8. Hp cht A c cng thc dng MXy trong M chim 46,67% v khi lng. M l kim loi, X l phi kim c 3 lp e trong nguyn t. Ht nhn M c n p = 4. Ht nhn X c n = p ( n, p, n, p l s ntron v proton ca nguyn t M v X ). Tng s proton trong MX y l 58. Xc nh cc nguyn t M v X Bi 9. Nguyn t A c n p = 1, nguyn t B c n = p. Trong phn t AyB c tng s proton l 30, khi lng ca nguyn t A chim 74,19% .Tm tn ca nguyn t A, B v vit cng thc ha hc ca hp cht AyB ? Vit phng trnh ha hc xy ra khi cho AyB v nc ri bm t t kh CO2 vo dung dch thu c Bi 10. Tng s ht trong hp cht AB2 = 64. S ht mang in trong ht nhn nguyn t A nhiu hn s ht mang in trong ht nhn nguyn t B l 8. Vit cng thc phn t hp cht trn. Bi 11. Lp cng thc ha hc hp cht c to bi ln lt t cc nguyn t Na, Ca, Al vi: = O; Cl; = S; OH; = SO4; NO3; = SO3; = CO3 HS; HSO3; HSO4; HCO3; = HPO4; H2PO4 Bi 12. Cho cc nguyn t: Na, C, S, O, H. Hy vit cc cng thc ho hc ca cc hp cht v c c th c to thnh cc nguyn t trn? Bi 13. Cho cc nguyn t: Ca, C, S, O, H. Hy vit cc cng thc ho hc ca cc hp cht v c c th c to thnh cc nguyn t trn? Bi 14. Lp cng thc ha hc ca hp cht to bi st v oxi, bit c 7 phn khi lng st th kt hp vi 3 phn khi lng oxi. Bi 15. Hp cht kh B c t l v khi lng cc nguyn t to thnh: m C : mH = 6 : 1. Mt lt kh B ( ktc) nng 1,25g. Bi 16. Hp cht C, bit t l v khi lng cc nguyn t l: m Ca : mN : mO = 10 : 7 : 24 v 0,2 mol hp cht C nng 32,8 gam. Bi 17. Hp cht D bit: 0,2 mol hp cht D c cha 9,2g Na, 2,4g C v 9,6g O

Bi 18. Phn t khi ca ng sunfat l 160 vC. Trong c mt nguyn t Cu c nguyn t khi l 64, mt nguyn t S c nguyn t khi 32, cn li l nguyn t oxi oxi. Cng thc phn t ca ng sunfat l nh th no? Bi 19. Xc nh cng thc phn t ca Cu xOy, bit t l khi lng gia ng v oxi trong oxit l: 4 : 1? Bi 20. t chy hon ton 13,6g hp cht A, th thu c 25,6g SO 2 v 7,2g H2O. Xc nh cng thc ca A Bi 21. t chy hon ton m gam cht A cn dng ht 5,824 dm3 O2 (ktc). Sn phm gm c CO2 v H2O c chia thnh hai phn: - Phn 1 cho i qua bnh ng P2O5 thy khi lng bnh ng P2O5 tng thm 1,8 gam. - Phn 2 cho i qua bnh ng CaO thy khi lng bnh CaO tng thm 5,32 gam. Tm m v cng thc n gin A. Tm cng thc phn t ca A bit rng iu kin thng A l cht kh. Bi 22. t chy hon ton 4,5g hp cht hu c A. Bit A cha C, H, O v thu c 9,9g kh CO2 v 5,4g H2O. Lp cng thc phn t ca A. Bit phn t khi A l 60. Bi 23. t chy hon ton 7,5g hirocacbon A ta thu c 22g CO2 v 13,5g H2O. Bit t khi hi so vi hir bng 15. Lp cng thc phn t ca A. Bi 24. t chy hon ton 0,3g hp cht hu c A . Bit A cha C, H, O v thu c 224cm3 kh CO2 (ktc) v 0,18g H2O. lp cng thc phn t ca A. Bit t khi ca A i vi hiro bng 30. Bi 25. t chy 2,25g hp cht hu c A cha C, H, O phi cn 3,08 lt oxi (ktc) v thu c VH2O = 45 VCO2 . Bit t khi hi ca A i vi H2 l 45. Xc nh cng thc ca A Bi 26. Hiro A l cht lng, c t khi hi so vi khng kh bng 27. t chy A thu c CO2 v H2O theo t l khi lng 4,9 : 1. Tm cng thc ca A Bi 27. Mt hp cht Y c phn t khi l 58 vC. Cu to t 2 nguyn t C v H trong nguyn t C chim 82,76% khi lng ca hp cht. Tm cng thc phn t ca hp cht . Bi 28. Hp cht X c phn t khi bng 62 vC. Trong phn t ca hp cht nguyn t oxi chim 25,8% theo khi lng, cn li l nguyn t Na. S nguyn t ca nguyn t O v Na trong phn t hp cht l bao nhiu ? Bi 29. Mt hp cht X C thnh phn % v khi lng l: 40%Ca, 12%C v 48% O. Xc nh cng thc phn t ca X. Bit khi lng mol ca X l 100g. Bi 30. Tm cng thc ho hc ca cc hp cht sau. a. Mt cht lng d bay hi, thnh phn phn t c 23,8% C, 5,9%H, 70,3%Cl v c phn t khi bng 50,5. b. Mt hp cht rn mu trng, thnh phn phn t c 40% C, 6,7% H, 53,3% O v c phn t khi bng 180. Bi 31. Mui n gm 2 nguyn t ho hc l Na v Cl. Trong Na chim 39,3% theo khi lng. Hy tm cng thc ho hc ca mui n, bit phn t khi ca n gp 29,25 ln phn t khi H2. Bi 32. Trong hp cht XHn c cha 17,65% H. Bit hp cht ny c t khi so vi kh metan CH4 l 1,0625. X l nguyn t no ? Bi 33. Hai nguyn t X kt hp vi 1 nguyn t oxi to ra phn t oxit. Trong phn t, nguyn t oxi chim 25,8% v khi lng.Tm nguyn t X Bi 34. Nung 2,45 gam mt cht ha hc A thy thot ra 672 ml kh O2 (ktc). Phn rn cn li cha 52,35% kali v 47,65% clo (v khi lng). Tm cng thc ha hc ca A.

Bi 35. Hai nguyn t X kt hp vi 1 nguyn t O to ra phn t oxit. Trong phn t, nguyn t oxi chim 25,8% v khi lng. Hi nguyn t X l nguyn t no? Bi 36. Mt nguyn t M kt hp vi 3 nguyn t H to thnh hp cht vi hiro. Trong phn t, khi lng H chim 17,65%. Hi nguyn t M l g? Bi 37. Hai nguyn t Y kt hp vi 3 nguyn t O to ra phn t oxit. Trong phn t, nguyn t oxi chim 30% v khi lng. Hi nguyn t X l nguyn t no? Bi 38. Mt hp cht c thnh phn gm 2 nguyn t C v O. Thnh phn ca hp cht c 42,6% l nguyn t C, cn li l nguyn t oxi. Xc nh v t l s nguyn t C v s nguyn t O trong hp cht. Bi 39. Lp cng thc phn t ca A. Bit em nung 4,9 gam mt mui v c A th thu c 1344 ml kh O2 ( ktc), phn cht rn cn li cha 52,35% K v 47,65% Cl. OXI - KHNG KH Bi 1. t chy 14 gam st trong 8,96 lt kh oxi (ktc), sau khi phn ng xy ra hon ton th dng li. 1. Sau phn ng cht no cn d v d vi s mol l bao nhiu? 2. Tnh khi lng oxit st t thu c. Bi 2. Cho 2,24 lt kh hiro i qua 12g bt ng oxit nung nng. Sau khi phn ng hon ton th dng li. 1. Sau phn ng cht no cn d, nu l cht kh th d bao nhiu lt, nu l cht rn th d bao nhiu gam? 2. Xc nh lng kim loi Cu thu c. Bi 3. t nng hon ton 24,5g KClO3 vi MnO2, cht kh thu c dng t chy 3,36 lt kh metan. 1. Hy xc nh xem kh oxi hay kh metan cn d v d vi th tch l bao nhiu? 2. Khi cho lng kh thu c sau phn ng t chy vo bnh cha nc vi trong d thu c bao nhiu gam cht rn (CaCO3). Bit th tch cc kh u o iu kin tiu chun. Bi 4. t chy 10 lt kh metan trong 100 lt kh oxi. Cht no cn d sau phn ng v d vi th tch l bao nhiu lt? Nu t chy 10 lt kh metan trong 100 lt khng kh. Hi sau phn ng kh metan hay oxi cn d, bit rng khng kh c 20% kh oxi v 80% kh nit v th tch. Tnh th tch cc khi cn li sau phn ng. Bi 5. t chy hon ton 42 gam hn hp A gm C v S. 1. Tnh th tch hn hp kh thu c bit rng C chim 42,85% hn hp A. 2. Tnh th tch khng cn dng (ktc) t chy ht hn hp A. Bit oxi chim 20% th tch khng kh. Bi 6. Vit cc phng trnh ha hc biu din cc bin ha sau, cho bit mi ch ci A v B l mt cht ring bit: (1) (2) (3) (4) (5) 1. H2O H2 Cu CuO CuCl2 Cu. (1) (2) (3) (4) (5) (6) 2. KMnO4 O2 CO CO2 Ca(HCO3)2 CaCO3 CO2. (1) (2) (3) (4) (5) (6) 3. FeS2 Fe2O3 Fe Cu A B Cu Bi 7. C 11,15 gam ch oxit c nung nng di dng kh hiro. Sau khi ngng nung nng, sn phm rn A thu c c khi lng l 10,38 gam. Tnh thnh phn khi lng A. Bi 8. C hn hp gm Fe v Fe2O3, chia hn hp thnh 2 phn bng nhau: - Phn 1 ngm trong dung dch HCl d, phn ng xong thu c 4,48 lt kh H2 (ktc). - Phn 2 nung nng v cho dng kh H2 d i qua th thu c 33,6 gam Fe.

Tnh thnh phn % theo khi lng ca mi cht c trong hn hp ban u. Bi 9. Kh hon ton 3,48g mt oxit ca kim loi M cn dng 1,344 lt kh H 2 (ktc). Ton b lng kim loi thu c cho tc dng vi dung dch HCl d thu c 1,008 lt kh H2 (ktc). Tm kim loi M v oxit ca n. Bi 10. Ngm mt l km nh trong dung dch HCl, phn ng xong ngi ta ly l km ra khi dung dch, ra sch v lm kh, nhn thy khi lng l km gim 6,5g so vi trc phn ng. 1. Tnh th tch kh H2 thu c (ktc). 2. Tnh khi lng HCl tham gia phn ng. 3. Dung dch cht no cn li sau phn ng? Khi lng ca cht trong dung dch l bao nhiu? Bi 11. Kh hon ton 16 gam mt oxit st bng CO nhit cao. Sau khi phn ng kt thc thy khi lng cht rn gim i 4,8 gam. Hy xc nh cng thc ha hc ca oxit st. Bi 12. Ha tan hon ton 3,78 gam mt kim loi X bng dung dch HCl thu c 4,704 lt kh H2 (ktc). Xc nh kim loi M. Bi 13. t chy hon ton 6,3 gam mt hirocacbon A, sn phm thu c dn vo bnh nc vi trong d thy khi lng bnh tng thm 27,9 gam v thu c 45 gam kt ta. Hy xc nh cng thc ha hc ca hirocacbon A trn. Bi 14. Cho 17,5g hn hp gm 3 kim loi Al, Fe v Zn tc dng vi dung dch H 2SO4 (long d) thu c a gam mui v 11,2 lt kh H2 (ktc). Hy tnh a. Bi 15. ho tan hon ton 8 gam mt oxit kim loi cn dng 300ml dung dch HCl 1M. Xc nh cng thc phn t oxit kim loi. Bi 16. Cho kim loi Na vo dung dch CuSO4 (d) thu c kt ta. Lc kt ta em nung nng thu c mt cht rn mu en. Dng kh H2 kh cht rn ny thu c 16g mt kim loi mu . Xc nh khi lng Na dng ban u. TAN CA MT CHT Bi 1. tan l g? Cho 250 gam dung dch NaCl tc dng vi lng va dung dch AgNO 3 thu c 129,15 gam kt ta (trong iu kin 25o C). Cho bit dung dch NaCl dng bo ho hay cha bo ho? Bit rng tan ca NaCl l 36 gam 25o C. Bi 2. C 600g dung dch NaCl bo ho 90o C c lm lnh xung 0o C. Tnh khi lng mui kt tinh thu c bit tan ca NaCl 90o C l 50, 0o C l 35. Bi 3. 25o C ngi ta ho tan 450g KNO3 vo 500g nc ct thu c dung dch A. Bit rng tan ca KNO3 20o C l 32. Hy xc nh lng KNO3 tch ra khi dung dch A khi lm lnh v 20o C. Bi 4. Xc nh khi lng mui KCl kt tinh c sau khi lm ngui 604g dung dch KCl bo ho 80o C xung 20o C. Bit rng tan ca KCl 80o C v 20o C ln lt l 51 v 34. Bi 5. tan ca NaNO3 100o C l 180 v 20o C l 88. C bao nhiu gam NaNO3 kt tinh li khi h nhit ca 84g dung dch NaNO3 bo ho t 100o C xung 20o C. Bi 6. Tnh khi lng AgNO3 kt tinh khi dung dch khi lm lnh 450g dung dch AgNO 3 bo ho 80o C xung 20o C. Bit tan ca AgNO3 80o C v 20o C ln lt l 668 v 222. Bi 7. Khi a 528g dung dch KNO3 bo ho 21o C ln 80o C th phi thm vo dung dch bao nhiu gam. Bit tan ca KNO3 21o C v 80o C ln lt l 32 v 170. Bi 8. Tnh khi lng AgNO3 tch ra khi dung dch khi lm lnh 2500g dung dch AgNO3 bo ho 60o C xung 10o C. Bit tan ca AgNO3 60o C v 10o C ln lt l 525 v 170.

Bi 9. Ly 1000g dung dch Al2(SO4)3 bo ho lm bay hi 100g H2O. Phn dung dch cn li a v 10o C thy c a gam Al2(SO4)3.18H2O kt tinh. Tnh a. Bit tan ca Al2(SO4)3 10o C l 33,5. Bi 10. Gi thit tan ca CuSO4 10o C v 80o C ln lt l 17,4 v 55. Lm lnh 1,5kg dung dch CuSO4 bo ho 80o C xung 10o C. Tnh s gam CuSO4.5H2O tch ra khi dung dch sau khi lm lnh. Bi 11. Xc nh tan ca Na2CO3 trong nc 18o C. Bit rng nhit ny, khi ho tan ht 143g mui ngm nc Na2CO3. 10H2O trong 160g H2O th thu c dung dch bo ho. Bi 12. tan ca CuSO4 nhit t1 l 20g, nhit t2 l 34,2g. Ngi ta ly 134,2g dung dch CuSO4 bo ho nhit t2 h xung nhit t1. Tnh s gam tinh th CuSO4.5H2O tch ra khi dung dch khi h nhit t t2 xung t1. Bi 13. Xc nh lng tinh th ngm nc Na2SO4.10H2O tch ra khi dung dch khi lm ngui 1026,4g dung dch Na2SO4 bo ho 80o C xung 10o C. Bit tan ca Na2SO4 khan 80o C l 28,3 v 10o C l 9. Bi 14. 25o C c 175g dung dch CuSO4 bo ho. un nng dung dch ln 90o C, hi phi thm vo dung dch bao nhiu gam CuSO4.5H2O c dung dch bo ho nhit ny. Bit tan ca CuSO4 khan 25o C l 40 v 90o C l 80. Bi 15. Tnh khi lng CuSO4.5H2O tch ra khi lm ngui 1877g dung dch CuSO4 bo ho 85o C xung 12o C. Bit tan ca CuSO4 khan 85o C l 87,7 v 12o C l 35,5. Bi 16. Cn ly bao nhiu gam nc v bao nhiu tinh th hirat c cng thc XY.10H 2O vi khi lng mol l 400g, pha trn mt dung dch bo ho 90o C m lm lnh n 40o C s lng xung 0,5 mol tinh th hirat c cng thc XY.6H2O. Cho bit tan ca mui khan XY 90o C l 90, 40o C l 60. PHA CH DUNG DCH (p dng s ng cho v phng trnh pha trn) Bi 1. C hai dung dch: Dung dch A cha H2SO4 85%, dung dch B cha HNO3 cha bit nng . Hi phi trn hai dung dch ny theo t l khi lng l bao nhiu c mt dung dch mi, trong H2SO4 c nng l 60%, HNO3 c nng l 20%. Tnh nng ca HNO3 ban u. Bi 2. C hai dung dch HNO3 40% (D = 1,25) v 10% (D = 1,06). Cn ly bao nhiu ml mi dung dch pha thnh 2 lt dung dch HNO3 15%(D = 1,08). Bi 3. C hai dung dch KOH 4% (D = 1,05) v 10%(D = 1,12). Cn ly bao nhiu ml mi dung dch pha ch thnh 1,5 lt dung dch KOH 8% (D = 1,10). Bi 4. C hai dung dch NaOH 10% (D = 1,11) v 40% c (D = 1,44). Cn ly bao nhiu ml mi dung dch pha thnh 2 lt dung dch KOH 20% (D = 1,22). Bi 5. Cn ly bao nhiu gam dung dch Fe(NO3)2 90% vo bao nhiu gam nc ct pha thnh 500g dung dch Fe(NO3)2 20%. Lm bay hi 75g nc t dung dch c nng 20% c dung dch c nng 25%. Hy xc nh khi lng ca dung dch ban u. Bit Dnc = 1g/ml. Bi 6. Phi ho tan thm bao nhiu gam KOH nguyn cht vo 1200g dung dch KOH 12% c dung dch 20%. Bi 7. C hai l ng dung dch HCl. L th nht c nng 1M, l th 2 c nng 3M. Hy pha thnh 50ml dung dch HCl c nng 2M t hai dung dch trn. Bi 8. Cn dng bao nhiu lt H2SO4 c D = 1,84g/ml vo bao nhiu lt nc ct pha thnh 10 lt dung dch H2SO4 c D = 1,28g/ml.

Bi 9. C hai dung dch HCl. Dung dch A c nng 0,3M, dung dch B c nng 0,6M. a. Nu trn A v B theo t l th tch VA : VB = 2 : 3 c dung dch C. Hy tm nng ca dung dch C. b. Phi trn A v B theo t l th tch nh th no c dung dch HCl mi c nng 0,4M. Bi 10. Trn 500g dung dch HCl 3% vo 300g dung dch HCl 10% th c dung dch A. Tm nng ca dung dch A. Bi 11. Trong phng th nghim, mt bn hc sinh mt l ng 150ml dung dch HCl 10% c D = 1,047g/ml vo mt l khc ng 250ml dung dch HCl 2M. Lc nh u tay. Theo em, dung dch mi thu c c nng mol l bao nhiu. Bi 12. Trn 0,5 lt dung dch NaCl 1M vi D = 1,01g/ml vo 100g dung dch NaCl 10% vi D = 1,1. Tnh nng % v nng mol ca dung dch thu c. Bi 13. Trn hai dung dch A v B theo t l th tch l 3 : 5. Nng mol ca dung dch sau khi trn l 3M. Tnh nng mol ca hai dung dch A v B bit rng nng mol ca dung dch gp hai ln nng ca dung dch Bi 14. Ho tan mt lng oxit kim loi ho tr II vo mt lng dung dch H 2SO4 20% va to thnh dung dch mui sunfat 22,64%. Tm cng thc ca oxit kim loi . Bi 15. Ho tan hon ton 10,2g mt oxit kim loi ho tr III cn 331,8g dung dch H 2SO4 va . Dung dch sau phn ng c nng 10%. a. Xc nh oxit kim loi. b. Tnh C% ca dung dch axit. Bi 16. C V1 lt dung dch HCl cha 9,125g cht tan (dung dch A). C V2 lt dung dch HCl cha 5,475g cht tan (dung dch B). Trn V1 lt dung dch A vi V2 lt dung dch B thu c dung dch C c V = 2 lt. a. Tnh CM ca dung dch C. b. Tnh CM ca dung dch A v dung dch B bit CM (A) - CM (B) = 0,4.