8. To analyse the acidic and basic radical in the given salt.[Sr(NO3)2]

Aim:- To analyse the acidic and basic radical in the given salt

Physical Appearance:-

Colour - White

Smell - Odourless

Appearance - Amorphous

Dry heating test:-

Procedure	Observation	Inference
Take a small amount of salt and heat	NO2  gas reddish brown turns ferrous sulfate solution black	NO3 may be present

Flame Tests:-

Procedure	Observation	Inference
Prepare a paste of the salt with concentrated HCl. Paste small amount of this paste on platinum wire loop and introduce it into the flame	Crimson-red colour flame appears	Sr2+ may be present.

Identification Of Acid Radicals (ANIONS):-

Dilute Sulfuric Acid Test:-

No reaction

Concentrated Sulfuric Acid Test:-

Procedure	Observation	Inference
Take a small amount of the salt with cone. H2SO4 in a test tube.	Radish brown gas with pungent smell turns FeSO4 solution black.	Gas – NO2  Possible radical NO3-.

Confirmation of Acid radicals by wet test:-

Aqueous Solution: Shake a little of the salt with water. If the salt dissolves, this aqueous solution obtained is used for the wet tests of acid radical and is called water extract.

Procedure	Observation	Inference
Ring Test: Add a small quantity of freshly prepared solution of ferrous sulfate to a part of the aqueous solution and then pour concentrated Sulfuric acid slowly along the sides of the test tube.	A dark brown ring is formed at the junction of the layers of the acid and the solution.	NO3- is present.

Wet test for basic radical (CATION):-

Preparation Of Original Solution: If the salt is insoluble in distilled water as well as dilute HCl, try to dissolve it in concentration HCl first in cold and then on heating. The clear solution thus obtain is labelled as original solution.

Analysis of Group–Zero:-

Procedure	Observation	Inference
The solid salts is heated with concentrated NaOH.	No gas evolved	NH4+ is not presence. Group Zero is absent.

Analysis of Group 1

Procedure	observation	Inference
Add dilute original solution prepared with water.	No precipitate	Group 1 is absent

Analysis of Group 2

Procedure	Observation	Inference
Take 2ml of the original solution in a test tube and make it acid by adding HCl and warm the content. Then pass H2S gas through the Kipp’s apparatus.	No precipitate.	Group 2 is absent.

Analysis of Group 3.

Procedure	Observation	Inference
Take about 5 ml of the original solution and add 4-5 drops of concentrated nitric acid. Boil the solution for sometimes. Add 2g of solid NH4Cl and boil again. Cool the solution under tap. Add access of ammonium hydroxide to it and shake.	No precipitate.	Group 3 is absent.

Analysis of Group 4

Procedure	Observation	Inference
Take the ammonical solution and pass H2S gas through the solution.	No precipitate.	Group 4 is absent

Analysis of Group 5

Procedure	Observation	Inference
To the O.S solution add 2-3g of solid NH4cl, boil, cool and add NH4OH till the solution smell of ammonia. Then add (NH4)2 Co3 solution	White precipitate.	Group 5 is present

Test of Sr²⁺:-

Ammonium sulfate Test

Procedure	Observation	Inference
To one part of solution add 1ml of ammonium sulfate solution and warm.	White precipitate.	Sr2+ is present.

Results:-

Acid Radicals:- NO₃^-

Basic Radicals:- Sr²⁺

The salt is Sr(NO₃)₂