Скачать или смотреть PHOSPHATE RADICAL : SPECIAL GROUP ( SALT ANALYSIS ) ALL PUNJAB BOARD PRACTICALS

Acidic radicals can be identified easily through the scheme available .
We will do step by step tests according to scheme and identify the given
acidic radicals .

Salt + dil. H2SO4 ------------= Gas evolved ------------= Dilute Acid Group

If no gas is evolved then add conc. H2SO4

Salt + conc. H2SO4 ------------= Gas evolved ------------= Concentrated Acid Group

If no gas is evolved then it is special group

Salt + conc. H2SO4 ------------= No gas evolved ------------= Special Group

Take a small amount of salt in test tube and add dil H2SO4 into it .
We are doing tests for phosphate, So some common salts containing it are
sodium phosphate, potassium phosphate , calcium phosphate etc.

By adding dil. H2SO4 , No gas is evolved , so it indicates that
Acidic Radical doesnot belong to Dilute Acid Group .

Now Add conc H2SO4 to solid salt .

By adding conc. H2SO4 , no gas is evolved , so it indicates that
Acidic Radical doesnot belong to Concentrated Acid Group.

This means our Radical belongs to special group .
Add BaCl2 solution to identify the radical within Special group.

The precpitates formed will be insoluble in HCl ,
so it is Phosphate Radical .

WET TESTS
We will perform tests according to scheme to identify the acidic radicals.
In the scheme , O.S stands for Original Solution .
Tests will be performed by making solution of salt with distilled water .

So , Firstly we will make Original Solution of our given salt .
O.S + AgNO3 solution -------------= Yellow ppt formed

Ca3(PO4)2 + AgNO3 ----------------= Ca(NO3)2 + Ag3PO4

CONFIRMATORY TESTS FOR PHOSPHATE:

(i) O.S + conc. HNO3 + ammonium molbdate solution
-------------= Yellow ppt formed

(ii) O.S + FeCl3 solution --------------= Yellow ppt formed

O.S + conc. HNO3 + ammonium molbdate solution
-------------= Yellow ppt formed

Ca3 (PO4)2 + ( NH4 ) 2 MoO4 ---------------=
NaNO3 + NH4NO3 + H2O + ( NH4 )3PO4.12 MoO3. 6 H2O
( yellow ppt )

O.S + FeCl3 solution --------------= Yellow ppt formed

Ca3 (PO4)2 + FeCl3 -------------= CaCl2 + Fe PO4 ( yellow ppt )
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