8.1 (c) insoluble salts

16
CONTENT INTRODUCTION METHOD PROCEDURE

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Page 1: 8.1 (c) insoluble salts

CONTENT

INTRODUCTION

METHOD

PROCEDURE

Page 2: 8.1 (c) insoluble salts

The INSOLUBLE SALT is one of salt that can not dissolve in water at room temperature

INSOLUBLE SALT

Page 3: 8.1 (c) insoluble salts

The examples of insoluble salt:

Stalactite

Pearl

Coral

Page 4: 8.1 (c) insoluble salts

DOUBLE DECOMPOSITION METHOD

METHOD

In double decomposition reaction, ions from the two different aqueous solution are exchangeable to form one of new compound which is not soluble in water.

Solution A:contain the metal ion (cation,M+)

+

Solution B:contain the

non-metal ion(anion,X-)

Insoluble SaltPrecipitate

MX

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CONTINUE….

In this method, requires two solution:

Page 6: 8.1 (c) insoluble salts

DOUBLE DECOMPOSITION METHOD For example, plumbum (II) chloride, PbCl2 is one of the insoluble salt.Pb(NO3)2 + 2 KCl PbCl2 +2 KNO3

Pb2+ 2 Cl-+ PbCl2

CONTINUE….

Page 7: 8.1 (c) insoluble salts

DOUBLE DECOMPOSITION METHODCHEMICAL EQUATION

Ca(NO3)2

Ca+ 2NO3-

Na2SO4

2Na+ SO42+

+

Ionic Equation:

Ca2+ + SO42+ CaSO4

Ca(NO3)2 Na2S04 CaSO4 2NaNO3+ +

Page 8: 8.1 (c) insoluble salts

PROCEDURE OF PRECIPITATION REACTION

Mix two solution

Filtration

Wash

Dry

Pure salt crystal

Preparation of PbI2

Page 9: 8.1 (c) insoluble salts

ACTIVITY 8.7ACTIVITY 8.7

AIM : TO PREPARE AIM : TO PREPARE INSOLUBLE SALT BY USING INSOLUBLE SALT BY USING PRECIPITATION REACTIONPRECIPITATION REACTION

Page 10: 8.1 (c) insoluble salts

MATERIALS : 1 MOL DMMATERIALS : 1 MOL DM-3-3 LEAD (II) NITRATE LEAD (II) NITRATE SOLUTION, 1 MOL DMSOLUTION, 1 MOL DM-3 -3 POTASSIUM IODIDE POTASSIUM IODIDE

SOLUTION, 1 MOL DMSOLUTION, 1 MOL DM-3-3 BARIUM NITRATE BARIUM NITRATE AND 1 MOL DMAND 1 MOL DM-3-3 POTASSIUM SULPHATE POTASSIUM SULPHATE

APPARATUS : 250 CM3 BEAKER, GLASS ROD, APPARATUS : 250 CM3 BEAKER, GLASS ROD, FILTER FUNNEL AND FILTER PAPERFILTER FUNNEL AND FILTER PAPER

Page 11: 8.1 (c) insoluble salts

1. Add 50 cm3 of potassium iodide solution to 50 cm3 of lead (II) nitrate solution

2.stir with the glass rode

Yellow precipitate occur

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Filter the mixture after the precipitate occur

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Wash the precipitate of salt with deionized water

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Dry the precipitate

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Pure salt crystal formed

Page 16: 8.1 (c) insoluble salts