Soalan Bab Salts Jpnt 2009

7/31/2019 Soalan Bab Salts Jpnt 2009

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I. SOALAN DRP JPNT 2009 BAB SALTS8 (a) A student has carried out an experiment to construct an ionic equation for the formation of

lead(II) iodide.

Seorang pelajar telah menjalankan satu eksperimen untuk membina persamaan ion bagi

pembentukan plumbum(II) iodida.

Seven test tubes of the same size were labelled 1 to 7. A fixed volume of 5.0 cm3 of 1.0 moldm-3

potassium iodide solution was placed in each test tube. 0.5 cm3 of 1.0 moldm-3 lead(II) nitrate

solution was added into test tube 1, 1.0 cm3 into test tube 2 and so on until 3.5 cm3 was addedinto test tube 7. The heights of the precipitate formed in each test tube were measured.

Tujuh buah tabung uji yang sama saiz dilabelkan dengan 1 hingga 7. Isipadu tetap 5.0 cm3 larutan

kalium iodida 1.0 moldm-3 diletakkan dalam setiap tabung uji. 0.5 cm3 larutan plumbum(II) nitrat

1.0 mol dm-3 ditambah ke dalam tabung uji 1, 1.0 cm3 ke dalam tabung uji 2, dan seterusnya

sehingga 3.5 cm3 ditambah ke dalam tabung uji 7. Tinggi mendakan yang terbentuk dalam setiap

tabung uji diukur.

The results are shown in Table 8.

Keputusan ditunjukkan dalam Jadual8.

Test tubeTabung uji

1 2 3 4 5 6 7

Volume of 1.0 moldm-3

lead(II) nitrate solution

/ cm3

Isipadu larutan

plumbum(II) nitrat1.0

moldm-3 / cm3

0.5 1.0 1.5 2.0 2.5 3.0 3.5

Height of precipitate /cm

Tinggi mendakan / cm1.1 2.2 3.4 4.4 5.5 5.5 5.5

Table /Jadual 8

(i) Based on Table 8, plot a graph of the height of the precipitate against volume of lead(II)

nitrate solution on the graph paper provided at page 20.

Berdasarkan Jadual8, plotkan graf tinggi mendakan lawan isipadu larutan plumbum(II)

nitrat pada kertas graf yang disediakan di muka surat20.

[3 marks]

(ii) Determine the volume of lead(II)nitrate solution that had reacted completely with 5.0 cm3

of 1.0 moldm-3 potassium iodide.

Tentukan isipadu larutan plumbum(II) nitrat yang telah bertindak balas lengkap dengan 5.0

cm3larutan kalium iodida 1.0 mol dm-3 .

[1 mark]

(iii) Using the volume obtained in (a) (ii), calculate the number of moles of lead(II) ions and

iodide ions that are required for the formation of lead(II) iodide.Dengan menggunakan isipadu yang diperolehi dalam (a) (ii), hitungkan bilangan mol bagi

ion plumbum(II) dan ion iodida yang diperlukan untuk pembentukan plumbum(II) iodida.

Then, calculate the number of moles of iodide ions that has reacted with 1 mol of lead(II)

ions.

Kemudian, hitungkan bilangan mol ion iodida yang bertindak balas dengan 1 mol ion

plumbum(II).

[4 marks]

(iv) Write the ionic equation for the formation of lead(II) iodide.

Tuliskan persamaan ion bagi pembentukan plumbum(II) iodida.

[2 marks]

(b) Diagram 8 shows conversion of salt X when it heated strongly and dissolved in water.The solution formed is tested with sodium hydroxide, NaOH solution.

Rajah 8 menunjukkan penukaran bagi garam X apabila dipanaskan dengan kuat dan dilarutkan

dalam air. Larutan yang terbentuk diuji dengan larutan natrium hidroksida,NaOH.


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2

+ +

H2O

Diagram /Rajah 8

Based on the information in diagram 8 :

Berdasarkan maklumat dalam Rajah 8 :

(i) Identify an anion that is present in salt X. Describe a chemical test to verify the anion.Kenal pasti satu anion yang hadir dalam garam X. Huraikan satu ujian kimia untuk

menentusahkan anion itu.

[4 marks](ii) Identify three cations that are possible present in salt X solution.

Describe chemical test to verify the cations.

Kenalpasti tiga kation yang mungkin hadir dalam larutan garam X.

Huraikan ujiankimia untuk menentusahkan kation itu.

[6 marks

Question 8 (a) (i)

Salt X solid

Pepejal garam

X

Metal oxide

Oksida logamBrown gas

Gas perang

Colourless gas

Gas tanpa warna

Salt X solution

Larutan garam X

A white precipitate soluble in excess NaOH.

Mendakan putih larut dalamNaOH

berlebihan.NaOH solution

LarutanNaOH


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II. SOALAN SBP 2009

1 Diagram 4 shows Experiments I and II in the preparation of a salt.

Rajah 4 menunjukkan Eksperimen 1 dan II dalam penyediaan garam.

Experiment

Eksperimen

Method

Kaedah

I

II

Diagram 4

Rajah 4

(a) Based on Experiment I:

Berdasarkan Eksperimen I :

(i) State the name for the reaction.

Nyatakan nama bagi tindak balas itu.

......................................................................................................................................

[1 mark]

(ii) Write the chemical equation for the reaction that occurs in the conical flask.

Tuliskan persamaan kimia bagi tindakbalas yang berlaku di dalam kelalang kon.

................................................................................................................................[1 mark]

(iii) State the colour change in the conical flask at the end point.

Nyatakan perubahan warna di dalam kelalang kon pada takat akhir.

..................................................................................................................................[1 mark]

(iv) Calculate the volume of hydrochloric acid used to neutralise the sodiumhydroxide solution.

Hitungkan isi padu asid hidroklorik yang digunakan untuk meneutralkan larutan

natrium hidroksida.

0.1 mol dm-3 hydrochloricacid

0.1 mol dm-3asid hidroklorik

25.0 cm3 of 0.2 mol dm-3 sodium hydroxide +

phenolphthalein

25.0 cm3 natrium hidroksida 0.2 mol dm-3 +

fenolftalein

Precipitate X

Mendakan X

Excess potassium iodide

solution

Larutan kalium iodida

berlebihan

10 cm3 of 1.0

mol dm-3

lead(II) nitrate

solution

10 cm3 larutan

plumbum(II)

nitrat

1.0 mol dm-3


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Diagram 3.1

(a) (i) Name the reaction that takes place in both experiments .

Namakan tindak balas yang berlaku dalan kedua-dua eksperimen tersebut.

......................................................................................................................

[1 mark]

(ii) Write the chemical equation for the reaction in Experiment I.Tuliskan persamaan kimia untuk tindak balas di Eksperimen I.

......................................................................................................................

[2 mark]

(b) (i) State the colour change in the conical flask in Experiment I

Nyatakan perubahan warna yang berlaku di dalam kelalang kon dalameksperimen I.

......................................................................................................................

[1 mark]

(ii) State the necessary step to be taken in the titration process so that a pure salt can be

obtained in Eksperiment I .Nyatakan langkah yang perlu diambil dalam proses pentitratan supaya garam tulen

dapat diperolehi dalam Eksperimen I

......................................................................................................................

[1 mark]

(c) Sulphuric acid in this reaction is a strong acid.

Asid sulfurik dalam tindak balas ini adalah asid kuat.

(i) Give another example of a strong acid.

Beri satu contoh asid kuat yang lain.

......................................................................................................................

[1 mark]

(ii) What is the chemical formula of the salt formed if the acid in (c)(i) is used instead of

sulphuric acid in Experiment I?

Apakah formula kimia bagi garam yang terhasil jika asid di (c)(i) digunakan sebagai

ganti asid sulfurik dalam Experimen I?

......................................................................................................................

[1 mark]

(d) (i) Name the salt produced in Experiment II.

Namakan garam yang terhasil dalam Eksperimen II

......................................................................................................................

[1 mark]

(ii) Why is it necessary to add the copper (II) oxide powder until it is in excess in the

solution ?

Mengapakah serbuk kuprum(II) oksida perlu ditambahkan sehingga

berlebihan di dalam larutan itu?

......................................................................................................................

[1 mark]

(iii) If the same salt is to be prepared, name one other substance that can be used to replace

copper (II) oxide in Experiment II .Jika garam yang sama hendak disediakan , namakan satu bahan lain yang boleh

digunakan bagi menggantikan kuprum (II) oksida dalam Eksperimen II.

...

1


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[1 mark]

IV. SOALAN NEGERI SELANGOR 2009

3. Diagram 3.1 and diagram 3.2 show the set-up of apparatus used to prepare salt X and salt Y inExperiment I and Experiment II respectively.

Rajah 3.1 dan rajah 3.2 menunjukkan susunan radas untuk menyediakan garam X dan garam Y dalam

Eksperimen I dan Eksperimen II masing-masing.

(a) Experiment I:

(i) State the name of salt X prepared in Experiment I.

Nyatakan nama garam X yang disediakan dalam Eksperimen I.

....

[ 1 mark](ii) 25 cm3 of 1.0 mol dm-3 ammonia solution is titrated with 1.0 mol dm -3 sulphuric acid.

Write the chemical equation for the reaction.

25 cm3 larutan ammonia berkepekatan 1.0 mol dm-3 dititratkan dengan asid sulfiurik.

berkepekatan 1.0 mol dm-3

Tuliskan persamaan kimia untuk tindak balas ini.

..

[ 1 mark]

(iii) Calculate the volume of 1.0 mol dm-3 sulphuric acid required to react completely with t 25 cm3

of 1.0 mol dm-3 solution.

Hitungkan isipadu asid sulfurik berkepekatan 1.0 mol dm-3 yang diperlukan untuk bertindak

balas lengkap dengan 25 cm3 larutan ammonia berkepekatan 1.0 mol dm-3

[2 marks]

(iv) After the titration in (a) (ii), what is the next step of the procedure to prepare a pure sample of

salt X?

Selepas pentitratan di (a) (ii), apakah langkah yang seterusnya dalam prosedur untuk menyediakan

sampel garam X yang tulen?

[ 1 mark]

(v) What is the method used to separate the salt obtained after step (a) (iv)?

Apakah kaedah yang digunakan untuk mengasingkan garam yang diperolehi selepas langkah (a)

(iv)?

[ 1 mark]

(b) Experiment II:

Eksperimen II:

1.0 mol dm-3 sulphuric acid

Asid sulfurik 1.0 mol dm-3

25 cm3 of 1.0 mol dm-3

ammonia solution

+ phenolphthalein

25 cm3 larutan ammonia 1.0

mol dm-3

+ fenolftalein

Experiment I [Ekeperimen I]

Diagram 3.1 [Rajah 3.1]

Copper(II) carbonate

Kuprum(II) karbonat

50 cm3 of 1.0 mol dm-3

hydrochloric acid

50 cm3 asid hidroklorik

1.0 mol dm-3

Glass rod

Rod kaca

Experiment II [Eksperimen II]

Diagram 3.2 [Rajah 3.2]


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(i) State the name of salt Y prepared in Experiment II.

Nyatakan nama garam Y yang disediakan dalam Eksperimen II.

[ 1 mark]

(ii) State two observations in this experiment.

Nyatakan dua pemerhatian dalam eksperimen ini.

..[2 marks]

(iii) State the reason why copper(II) carbonate is added in excess.

Nyatakan sebab mengapa kuprum(II) karbonat ditambah dengan berlebihan.

[ 1 mark]

(iv) Copper(II) carbonate is also a salt. State the type of reaction used to prepare copper(II)

carbonate.

Kuprum(II) karbonat juga satu jenis garam. Nyatakan jenis tindak balas yang digunakan untuk

menyediakan kuprum(II) karbonat.

[ 1 mark]

V. SOALAN NEGERI PERAK 2009

9 (c) You are required to prepare dry zinc sulphate salt.

The chemical substances that are provided:

By choosing the correct substances and apparatus, describe a laboratory experiment to

prepare dry zinc sulphate salt.

In your description, include chemical equations involved.

Dengan memilih bahan-bahan dan alat radas yang betul, huraikan satu eksperimen

makmal untuk menyediakan garam zink sulfat yang kering.

Dalam huraian anda, nyatakan persamaan-persamaan kimia yang terlibat.

[10 marks]

[10 markah]

zinc nitrate solution Dilute sulphuric acid

larutan zink nitrat Asid sulfurik cair

sodium carbonate solution necessary apparatus

larutan natrium karbonat radas yang sesuai


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I. JAWAPAN SOALAN DRP JPNT 2009 BAB SALTS

8 (a) (i) Label axes with units

All points are transferred correctly

Shape of the graph is smooth and correct

1

1

1 3

(ii) 2.5 cm3 1

(iii

)

moles of Pb2+ ions = 2.5 x 1.0 / 0.0025

1000

moles of I- ions = 5 x 1.0 / 0.005

1000

Moles of I- ions react with one mol Pb2+ ions = 0.005/0.0025

= 2 mol

1

1

1

1 4

(iv) Pb2+ + 2I- PbI2

The formulae of reactant and product correct

Balance

1

1 2

(b) (i) nitrate ion / NO3- ion

Add dilute sulphuric acid followed by iron(II) sulphate into test tube

containing salt X solution

pour slowly concentrated sulphuric acid

A brown ring is formed.

1

1

1

1 4

(ii) Zn2+ , Pb2+ , Al3+

Add ammonia solution into test tube containing salt X solution until excess

White precipitate dissolves in excess ammonia solution showing the

presence of Zn2+ ions

White precipitate insoluble in excess ammonia solution showing the

presence of Pb2+ and Al3+ ions.

Add potassium iodide solution into test tube containing salt X solution

Yellow precipitate formed showing the presence of Pb2+ ions //

No change showing the presence of Al3+

ions.

1

1

1

1

1

1 6

TOTAL 2

0


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II. JAWAPAN SOALAN SBP 2009

III. JAWAPAN SOALAN NEGERI MELAKA 2009

3 (a) (i) Neutralisation(ii) 2NaOH + H2SO4 Na2SO4 + 2H2O

1. Correct formulae of reactants and products

2. Correctly balanced

(b) (i) Pink to colourless // the pink colour decolourised

(ii) Repeat the titration but without using phenolphthalein / any indicator

c (i) [Any suitable name/formula of strong acid]

eg. Hidrochloric acid / HCl // Nitric acid / HNO3(ii) [ formula of salt must corresponds to acid in (c)(i)]

eg. NaCl // NaNO3d (i) Copper(II) sulphate

(ii) So that all the sulphuric acid in the beaker is used up(iii) Copper (II) Carbonate

Total

IV. JAWAPAN SOALAN NEGERI SELANGOR 2009

3 (a) (i) [Able to name salt X correctly]

Ammonium sulphate 1 .....1

(ii) [Able to write the balanced equation correctly]

2NH3 + H2SO4 (NH4)2SO4 1 .....1

(iii

)

[Able to show the calculation correctly]

2

1

VM

VM

bb

aa=

1

4 (a) (i) Neutralization 1

(ii) HCl + NaOH NaCl + H2O 1

(iii) Pink turns colourless 1

(iv)

1

1=

MbVb

MaVa,

1

1

2.0

1.0=

Vb

Va, Va = 50 cm

31+1

(b) (i) Double decomposition/ Precipitate reaction 1

(ii) Lead(II) iodide

1

(iii) Pb2+ + 2I- PbI2 1

(c)Number of moles of Pb(NO3)2 =

1000

100.1 = 0.01

Mass of PbI2 = 0.01 461 = 4.61 g

1

1

Total 10


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2

1

25x0.1

xV0.1 a=

Va = 12.5 cm3

1 .....2

(iv) [Able to describe the next step correctly]

Add 12.5 cm3 of sulphuric acid to 25 cm3 of 0.5 mol dm-3 ammonia

solution without phenolphthalein. 1 .....1

(v) [Able to state the name of the method correctly]

Crystallisation 1 .....1

(b) (i) [Able to name salt Y correctly]

Copper(II) chloride 1 .....1

(ii) [Able to state two observations correctly]

Gas bubbles

The white solid dissolves

2

Blue solution formed

2 .....2

(iii

)

[Able to state the reason of copper (II) carbonate is added in excess]

So that all the hydrochloric acid reacts completely 1 .....1

(iv) [Able to name the type of reaction correctly]

Double decomposition 1 .....1

TOTAL 11

V. JAWAPAN SOALAN NEGERI PERAK 2009

9 (c) Pour [20-100]cm3 of zinc nitrate solution [0.1-1.0]mol dm-3 into a beaker

Add [20-100]cm3 of sodium carbonate solution [0.1-1.0]mol dm-3

Pour [20-100]cm3 dilute/[0.1-1.0]mol dm-3 sulphuric acid into a beakerAdd the residue/precipitate into the acid until in excess

Stir and filter the mixture

Heat the filtrate until saturated / 1/3 of original volume

Cool the saturated solution

Filter and dry the crystal

Zn(NO3)2 + Na2CO3 ZnCO3 + 2NaNO3ZnCO3 + H2SO4 ZnSO4 + H2O + CO2

1

11

1

1

1

1

1

1

1

10

Any two answers

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Soalan Bab Salts Jpnt 2009