Why can sulphuric acid not be used in the test for so4 2 ions?

Why can sulphuric acid not be used in the test for so4 2 ions?

Sulfate ions in solution, SO 4 2 -, are detected using barium chloride solution. However, nitric acid is added first to acidify the test solution. Sulfuric acid cannot be used because it contains sulfate ions – these would interfere with the second part of the test.

Why must it be HCl used when testing for sulfate ions and not any other acid?

Explain why, in a test for sulfate ions, the sample is acidified with hydrochloric acid first. Carbonate ions also produce a white precipitate with barium chloride solution. The acid reacts with any carbonate ions present. This removes them, so stopping them giving a false positive result.

Why does barium not react with sulfuric acid?

Calcium, strontium and barium Calcium sulfate is slightly soluble, and strontium and barium sulfates are essentially insoluble. When exposed to sulfuric acid, a layer of insoluble sulfate is formed on each of these metals, slowing or stopping the reaction entirely.

What does dilute sulphuric acid test for?

Dilute sulfuric acid reacts with metals higher than hydrogen in the reactivity series to form sulfate salts and hydrogen gas. Note the metal reactions are different with concentrated sulfuric acid.

Why is nitric acid used in the test for halides and not hydrochloric acid?

As you said, one cannot add HCl to destroy carbonates in a sample which is to be tested for halide ions. Dilute nitric is the only choice, because you would not use sulfuric acid in the case of halides because (i) your test sample may contain ions which will precipitate with sulfate (Ba, Ag, Pb, Ca etc.).

What happens when sulphate ion is tested with BaCl2 solution?

Ans. When solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.

Which is worse hydrochloric acid or sulfuric acid?

Hydrochloric acid is a stronger acid than sulphuric acid since the Ka value (acid ionisation constant) of hydrochloric acid is 1.3 x 106 and that of sulphuric acid is 1 x 103. Therefore, hydrochloric acid is more dangerous than sulphuric acid.

What does not react with dilute sulfuric acid?

Explanation: Copper is the only metal which does not react with dilute sulphuric acid.

What metal does not react with sulfuric acid?

Metal of low activity With cold concentrated sulfuric acid, such metals as iron and aluminum do not react, as they are covered with an oxide film. This process is called passivation.

What’s the difference between HCl and sulphuric acid?

Difference Between Sulphuric Acid and Hydrochloric Acid 1 • HCl has one hydrogen atom and one chlorine atom. Sulfuric acid is H2SO4, , and has two hydrogen, one sulfur, and four… 2 • Sulphuric acid is a diprotic acid whereas hydrochloric is a monoprotic acid. More

Why do we use hydrochloric in the test for sulfate ions?

As you said, one cannot add HCl to destroy carbonates in a sample which is to be tested for halide ions. Dilute nitric is the only choice, because you would not use sulfuric acid in the case of halides because (i) your test sample may contain ions which will precipitate with sulfate (Ba, Ag, Pb, Ca etc.).

Why can’t we use HCl instead of H2SO4?

The nitronium ion that actually reacts to carry out nitrations will also tend to react with the chloride ions that HCl creates: …thus damaging your yields. It should be noted, however, that many nitrations can be carried out using pure nitric acid of a very high concentration.

Why do you use sulfuric acid in nitration?

First of all, as Matjaz Mraz has already pointed out, sulfuric acid withdraws water from the reaction and thus helps drive it to completion. And since HCl is normally supplied in aqueous form (31% or so), simply using it as an off-the-shelf product would also mean *starting* with a lot more water, further damaging the equilibrium.