determine the new molarity of calcium ions when 50.0 mL of a 1.50 M calcium chloride solution are combined with 750.0 mL of a 0.236 M calcium phosphate solution.

Answer 1

moles CaCl2 = M x L = ??
moles Ca^+2 = same

moles Ca3(PO4)2 = M x L = ??
moles Ca^+2 = 3x that.

Assuming the volumes are additive,
M = total moles/total volume.