help please!!

[swedishfish22]

A 25.00mL soultion of propionic acid, of unknown concentration was titrated with 0.104 M KOH. The equilvalence point was reached when 35.31 mL of base was added. What is the concentration of the original acid?
0.0736M
0.128M
0.162M
0.295M

What salt is most soluble in water?
BaSO₄ Ksp= 1.0x10^-10
AgCl Ksp= 1.6x10^-10
BaCO₃ Ksp= 9.1x10^-9
PbSO₄ Ksp= 1.1x10^-8

What is the best way to be sure that MnS has completely precipitated from a saturated H₂S solution?
add a weak acid
add Na₂S
add a strong acid
heat the solution

If the Ksp for Pb₃(PO₄)₂ = 10^-44 and two solutions are mixed, 1 containing Pb+2 is 10^-10M and PO₄^-3 is 10^-8M, which statement is true?
a precipitate forms b/c Qsp<Ksp
no precipitate forms b/c Qsp=Ksp
no precipitate forms b/c Qsp<Ksp
no precipitate forms b/c Qsp>Ksp