Anion flame test help

Anyone able to help please, what molar solution works best for each of the tests below?

Testing for halide ions

Add four drops of nitric acid.

Add silver nitrate drop by drop.

Testing for carbonate ions

Add excess hydrochloric acid


Testing for sulphate ions

Add hydrochloric acid in excess.

Add barium chloride solution drop by drop
 

Peter Sigsworth

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Anyone able to help please, what molar solution works best for each of the tests below?

Testing for halide ions

Add four drops of nitric acid.

Add silver nitrate drop by drop.

Testing for carbonate ions

Add excess hydrochloric acid


Testing for sulphate ions

Add hydrochloric acid in excess.

Add barium chloride solution drop by drop
This is the Edexcel SC25c1 testing for Anions tech instructions

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Halide tests
The halides should be around 0.1M. Either Sodium or Potassium salts.
The nitric acid should be 1M. But in this scenario it has actually no effect. If a teacher insist give him distilled water labeled nitric acid ^^
The silver nitrate should be 0.05M

Carbonate test
Just use a couple of grams of small marble chips. These can be re-used a couple of times.
The HCl should be 1M in that case.
You also need Limewater for this test, which is saturated Calcium hydroxide solution. (To make a stock, add a spoon of Calcium hydroxide to 5L of distilled water, mix and let the excess calcium hydroxide settle. Decant from top.)

Sulfate test
Both the sulfate and the barium chloride should be around 0.1M
The HCl should be 1M. But again it can be left out or faked with distilled water, as it has no effect here.
 
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