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Lp 10- chng trnh chunThc hin: Trn Th Chu Pha

Hiro sunfua

Lu hunh ioxit - Lu hunh trioxit

Bi 32

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Kim tra bi cCu 1: chn pht biu sai

D . Hai dng th hnh ca S c tnh cht ha hc rt khcnhau .

B . Hai dng th hnh ca S khc nhau v cu to tinh thv tnh cht vt l .C . Hai dng th hnh ca S c th bin i qua li theo nhit .

A . Phn t S c 8 nguyn t to mch vng .

Cu 2 : Pht biu no din t ng tnh cht ha hcca S

D . S ch tc dng c vi n cht.

B . S ch c tnhkh .

C . S va c tnh oxi ha va c tnh khA . S ch c tnh oxi ha

Em hy vit PTP minh ha

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Ni la ang hot ng

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Ni la ang hot ng

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Protein phn hy

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Lp 10- chng trnh chun

Hiro sunfua

Lu hunh ioxit - Lu hunh trioxit

Bi 32

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Ni dung

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I.Tnh cht vt lHidrosunfua l cht khc

Mu : Mi :

T khi :

Tnh tan trong nc: Tnh c :

2H S

kk

d =34

1.1729

= nng hn khng kh

Khng mu

Rt c t tan trong nc

Trng thi

A. HIDRO SUNFUA (H2S)

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Kh H2S ci vi ngi

v khi vo mu lm chohemoglobin ca mu chaion Fe2+ b ph hy to ra

FeSmu ha en

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Lmqu tm ha hng Tc dng vi dd baz to 2 loi mui:

Mui axit cha ion HS-nh NaHS

Mui trung ha cha ion S2- nh Na2S

II.Tnh cht ha hc

Hidosunfua tan trong nc to dung dch axit rt

yu (yu hn axit cacbonic), gi l axit sunfuhiric

A. HIDRO SUNFUA (H2S)

1. Tnh axit yu

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Natri hidrosunfua

Natri sunfua

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Nguyn t S c th c nhng s oxi ha no?

+6

+4

0

-2

H2S ch c

tnh khThp nht

H2S

S oxi ha no l ca S trong H2S ?Nhn xt g v s oxi ha ca S trong H2S ?

2. Tnh

kh mnh

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H2S tc dng oxi

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H2S tc dng oxi

TH2 : thiu oxiHin tng: cbt mu

vng to thnh (bm trn tm

knh) Ptp

TH1: d oxiHin tng: H2S chy cho

ngn la mu xanh nht

Ptp

-2 + 4

2 2 2 22 H S + 3 O 2 S O + 2 H O

ot

-2 0

2 2 vn g2H S + O 2 S + 2o

t

2. Tnhkh mnh

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III.Trng thi t nhin v iu ch

Trong t nhinhidrosunfua

thng c u?

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Trong kh ni la

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Trong mt s dng sui

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T xc cht ngi v ng vt

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Trongkh thi

cc nhmy

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Tc hi ca hidrosunfua

H2S nng cao lm t lit thn kinhkhu gic . Khng nhng th nu nng khong 1,2 mg/lit khng kh con ngi s

cht ngay. nng nh hn c th dnnhn m su

khi lm vic trong mi trng cH2S phi ht sc cn thn , eo khu trang

phng c.

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V sao ngi ta iu ch H2S trong phng th nghim

m khng iu ch trong cng nghip?

V H2S rt c vkhng c gi tr kinh t. Tuynhin trong phng th nghim n l ha cht thng

dngbi tnh kh mnh!

Nguyn tc: cho mui st (II) sunfua tc dng axitclo hidric

2 2FeS+2HCl FeCl +H S

Trong phng th nghim

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I- Tnh cht vt l

* Cht kh, khng mu, mi hc, nng

hn khng kh.*Tan nhiu trong nc.* c, gy vim ng h hp.

B - Lu hunh ioxit (SO2)

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23

II- Tnh cht ho hc

1. Lu hunh ioxit l oxit axit.

Tan trong nc to thnh axit sunfur l axit yu

SO2 + H2O H2SO3

SO2 + 2NaOH Na2SO3 + H2O

SO2 + NaOH NaHSO3

Natri hirosunfit

Natri sunfit

Axit sunfurTnh axit: H2SO3 > H2CO3

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05/19/10 24

NaOH

SO2

n

n

1 2

NaHSO3Na2SO3

NaHSO3

Na2SO3

Na2SO3

NaOHd-

d-

NaHSO3

SO2

=

SO2 + 2NaOH Na2SO3 + H2O

SO2 + NaOH NaHSO3

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SO2 + Br2 + H2O 2HBr + H2SO4

+4 0 +6-1

SO2 + 2 H2S 3S + H2O

+4 0-2

cht kh

cht oxi ho

Ngoi ra SO2 cn c tnh ty mu, tc dng cvi nc clo, dung dch KMnO4,

2

2

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26

III- ng dng v iu ch lu hunh ioxit

1. ng dng

SO2 dng sn xut axit H2SO4 Lm cht ty trng giy v bt giy, cht chng nm mc lng

thc thc phm

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2. iu ch

* Trong phng thnghim

Na2SO4 + SO2 + H2ONa2SO3 + H2SO4

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05/19/10 29

* Trong cng nghip:iu ch SO2 bng cch t

qung st pirit(FeS2) hoc t lu hunh

2 2O O

Ot

S S+

2 2 2 3 24 11 2 8

Ot FeS O Fe O SO+ +

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05/19/10 30

Ngun sinh SO2

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C CH GY MA AXIT

T h i it

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05/19/10 32

Tc hi ma axit

Mt cnh rng thng ca Czech b hy hoi bima axit. (nh chp thng 7/2006, theo PD)

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MA AXIT TN PH CC CNG TRNH NGH THUT

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34

I- Tnh cht SO3l cht lng khng mu, tan v hn trong nc v trong

axit sunfuric

L oxit axit:

II- ng dng v sn xut SO

3l sn phm trung gian iu ch H

2SO

4trong cng

nghip Sn xut:

2 SO2 + O2 2 SO3

SO3 + H2O H2SO4

C- Lu hunh trioxit(SO3)

3 4

3 2 4 2

O

O 2 a

S MgO MgSO

S NaOH N SO H O

+

+ +

ot

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Bi tp v nh

Lm 5,6,8,9,10 SGK/ 139