Missy Mae is given an unknown white ionic solid which contains of one cations, N

Question

Missy Mae is given an unknown white ionic solid which contains of one cations, Na^+, K^+, Ca^2+ and one of the anions Cl, ^- NO_3^-, SO_4^2- Write the formulas of all the possible ionic compounds which could be the unknown compound. Missy Mae performs a flame test on the unknown compound, which reveals a lilac color. An aqueous solution of the unknown compound yields the following results. forms no precipitate when 0.10 M sodium sulfate is added Forms a precipitate when 0.10 M silver nitrate is added Forms no precipitate when 0.10 M barium nitrate is added What is the formula of the unknown compound? Explain your reasoning. There is no precipitation test for nitrate ion. Explain why this is the case.

Explanation / Answer

1]

NaCl

KNO3

CaSO4

2]

Lilac colour is given by ----> K cation in flame test

White precipitate by Cl - ion on reaction with AgNO3

Formula ==> KCl

3]

Nitrate ion has the possibility of creating hydrogen bonds with water thus making its distribution in thewater matrix stable.

So nitrate ion does not form precipitate with any metals.

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