Question 10
A 75.0 −mL sample of 1.54×10−2 M Na2SO4(aq) is added to 75.0 mL of 1.22×10−2 M Ca(NO3)2(aq).
Part A
What percentage of the Ca2+ remains unprecipitated?
Express your answer using two significant figures.

the reaction that should be followed is
Na2SO4 + Ca(NO3)2 --> CaSO4 + 2NaNO3
first calculate the limiting reactant
mol Na2SO4 = 0.075 L (1.54×10−2 mol / L) = 1.155x10-3 mol

mol Ca(NO3)2 = 0.075 L (1.22×10−2 mol / L) = 9.15x10-4 mol
so the limiting reactant is the Ca(NO3)2

so all of the Ca2+ will be precipitated, percentage unprecipitated = 0.00 %

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Question 10 A 75.0 −mL sample of 1.54×10−2 M Na2SO4(aq) is added to 75.0 mL of 1.22×10−2 M Ca(NO3)2(aq). Part A What percentage of the Ca2+ remains unprecipitated? Express your answer using two significant figures.

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Question 10
A 75.0 −mL sample of 1.54×10−2 M Na2SO4(aq) is added to 75.0 mL of 1.22×10−2 M Ca(NO3)2(aq).
Part A
What percentage of the Ca2+ remains unprecipitated?
Express your answer using two significant figures.