You are given an unknown sample that when treated with hydrochloric acid forms a

Question

You are given an unknown sample that when treated with hydrochloric acid forms a precipitate. After decantating the liquid, you add boiling water to the remaining solid. Some of the solid disappears. You decant the solution and add a few drops of K_2CrO_4; No yellow solid appears. With the solid left from the addition of boiling water, you add ammonium hydroxide and centrifuge the product. No gray/black solid is present. You then decant the liquid and add concentrated nitric acid until the solution is acidic; a white precipitate forms. Which group 1 cations were present in your unknown? Incorrect; There is an error in your submission. Make sure you have formatted it properly

Explanation / Answer

Group 1 cation may be Ag+,Pb2+,Hg22+ as they all form insoluble chloride with Hcl.

As it don't give yellow ppt. With K2CrO4 so it can not be Ag+and Pb2+.

With ammonium hydroxide no grey/black ppt.

So it must be Hg22+

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