Suppose you have a solution that might contain any or all of the following catio

Question

Suppose you have a solution that might contain any or all of the following cations: copper(II) ion, silver ion, calcium ion, and chromium(II) ion. Addition of hydrobromic acid causes a precipitate to form. After filtering off the precipitate, sulfuric acid is added to the resultant solution and another precipitate forms. This is filtered off, and a solution of sodium hydroxide is added to the resulting solution. No precipitate is observed.

a.)Which cation is present in the first precipitate? b.) What is the net ionic equation for the first precipitation? c.) Which cation is present in the second precipitate? d.) What is the net ionic equation for the second precipitation? e.)Which of the given ions is absent from the given equation?

Explanation / Answer

a) silver cation precipitate first

b) net ionic equation: Ag+ (aq) + Br- (aq) ------------------>AgBr (s)

c) calcium ion precipitate second

d) net ionic eqation :   Ca+2 + SO4-2 ------------> CaSO4(s)

e) ions absent : Chromium and Copper ions

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