Chemistry Type 4 Chapter 8

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 Chemistry Contact form 4 Chapter 8 Study Paper

Chapter 8: Salts

1 . Salts A salt can be an ionic compound. The anion component comes from the acid while the cation part originates from a base. Case: KCl, KOH(aq) + HCl(aq) пѓ KCl(aq) + H2O(l) A salt is a compound formed if the hydrogen ion. H+ via an acid is replaced by a material ion or perhaps an ammonium ion, NH4+. Salts Nitrate salts Carbonate salts Chloride salts Soluble All nitrate salts Potassium carbonate, K2CO3 Ammonium carbonate, (NH4)2CO3 Salt carbonate, Na2CO3 All chloride salts Except пѓ Sulphate salts All sulphate debris Except пѓ 2 . Preparing and refinement of sencillo salts Business lead (II) chloride, PbCl2 Silver precious metal chloride, AgCl Mercury Chloride, HgCl Lead (II) sulphate, PbSO4 Barium sulphate, BaSO4 Cacium sulphate, CaSO4 Persatuan Bahasa Cina Pb Aktiengesellschaft Hg S A T All other carbonate salts Insoluble

i. ii. iii. iv.

The salts formed during preparation of soluble debris contain pollutants. These salts need to be filtered through a process known as recrystallisation. Physical characteristics of deposits: Crystals include fixed geometrical shapes such as a cuboid, rhombic or prism. Crystals of the same substance possess same shapes but could possibly be in different sizes. Crystals possess flat floors, straight corners and sharp angles. Crystals have fixed angles between two nearby surfaces.

Model 1: Planning of Soluble Salts пѓ Na2SO4

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Model 2: Preparing of Sencillo Salt пѓ MgSO4


Preparation of insoluble salts An insoluble salts can be prepared through precipitation reaction. Aqueous alternatives containing the ions from the insoluble sodium are combined together since the salt. The insoluble sodium is formed as being a precipitate and is obtained by simply filtration. Model: BaCl2(aq) & Na2SO4(aq) пѓ BaSO4(s) & 2NaCl(aq) Absurde salts may prepared by dual decomposition response through anticipation.

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Process of the selection of the process preparing 1 specified salt.


Qualitative Analysis of Salts Qualitative analysis is a chemical technique applied to determine what substance is present in a mixture but not their very own quantities. In the quantitative analysis of debris, we need to identify the ions that are present in salts. This can be done by examining their physical and chemical substance properties. Cations and anions in debris can be discovered through: a) Colour and solubility in the salt c) Effect of high temperature on salt e) Confirmatory test pertaining to cations b) Gas Evaluation d) Confirmatory test for anions


Colour and solubility from the salt Cation / corpuscule / salt / chemical substances which may be present 2+ 2+ 3+ 2+ + Debris of Los angeles, Mg, Ing, Pb, NH4 CuSO4 as well as Cu(NO3)2 CuCl2 CuCO3 FeSO4 / Fe(NO3)2 / FeCl2 Fe(SO4)3 as well as Fe(NO3)3 as well as FeCl3 PbO CuO ZnO PbCl2 PbI2

Colour Stable White Green Green Green Green Brownish Brown when ever hot and yellow once cooled Black Yellow once hot and white the moment cooled White colored Yellow Remedy Colourless Green Blue Absurde Green Yellowish / Browndish-yellow / Brown (depending about concentration) Absurde Insoluble Insoluble Insoluble in cold normal water but sencillo in warm water Insoluble in cold normal water but sencillo in warm water

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Gas Test Gas Oxygen, T-MOBILE Colour Colourless Smell Odourless Confirmatory evaluation Lights up a glowing wood splinter Diagram

Hydrogen, H2



Produce a ‘pop' sound using a lighted solid wood splinter

Co2, CO2



Becomes limewater gloomy

Ammonia, NH3


Stinky smell

a) Turns damp red litmus paper blue b) Generates thick white-colored fumes with hydrogen chloride, HCl gas

Chlorine, Cl2


Pungent smell

a) Bleaches moist red litmus paper b) Turns moist blue litmus paper to red then bleaches that

Hydrogen Chloride, HCl Nitrogen dioxide, NO2 Sulphur dioxide, SO2 Normal water vapour, INGESTING WATER


Pungent smell

Makes thick white-colored fumes with ammonia, NH3 gas

Dark brown

Pungent smell

Turns damp blue litmus paper reddish colored


Pungent smell

Bleaches the purple...