Question

What are the solubility rules for the following anions? SO32, PO4, NO3-, I Which of them would form precipitates when exposed to Ba', Ag"? Which of following anions would react with acid? SO:?, PO43-, NO3-,I If Ag2SO3 (s) is added to water, will it dissolve? What about if it is added to HNO3(aq)? The brown ring test will determine the presence of what anion in solution? What color is a Agl precipitate? When completing this lab, it is important to use good analytical technique. What are 3 tenets of good analytical technique? What are two ways to mix up the liquids in a test tube?

Answer 1

Solubility rule:

Generally all nitrates (NO3-) are soluble.

(SO₄)^2- all sulfates are soluble except those of Ba2+, Pb2+,Ca2+and Sr2+.

I- all iodides are soluble except Ag+,Pb+,and Hg₂²⁺.

PO₄^2- all phosphates are insoluble except Na+,K+.

SO₄^2- forms ppt with Ba2+ and gives BaSO4, and I- forms ppt with Ag+ to give AgI.

Usually phosphate (PO₄^2-) anion reacts with acid.

Ag2SO3 is hardly soluble in water and soluble in HNO3.

Usually NO3- ions gives brown ring test.

AgI ppt is yellow in color.

3tenents are : i) analytical measurements should be made to satisfy an agreed requirement.ii) making analytical measurements should be both qualified and competent to undertake the task.iii) there should be a regular independent assessment of the technical performance of lab.