H20 if they are present in the same solution? 2 How can you distinguish between

Question

H20 if they are present in the same solution? 2 How can you distinguish between so 1 and PO t1 PO 3. What would you do and how would you know that a precipitate contained either AgCl, or Agl, or both? o th 4. Why should you test for the presence of NOj ions in a solution before testing for the presence of Cl- and I-ions in that solution? 5. Why should a person not test for the presence of NOj ions in a solution that he or she plans to subsequently test for the presence of sulfate ions, So4? You y t brown ind test oit eaa to an diccwm

Explanation / Answer

RING TEST

A nitrate test, known as the brown ring test is performed by adding iron(II) sulfate to a solution of a nitrate, then slowly adding concentrated sulfuric acid such that the acid forms a layer below the aqueous solution. A brown ring will form at the junction of the two layers, indicating the presence of the nitrate ion.

2HNO3+ 3H2SO4 + 6FeSO4 --->> 3Fe2(SO4)3 + 2NO + 4H2O

[Fe(H2O)6]SO4 + NO = [Fe(H2O)5(NO)]SO4+ H2O

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