Can someone help me on these too?

Question

2. ) Potassium hydroxide reacts with phosphoric acid in a neutraliztion reaction. Write the balanced chemical equation for this reaction. What volume of 4.00 M potassium hydroxide would be required to neutralize 67.8mL of 0.645 M phosphoric acid? Write the balanced chemical equation for this reaction. If 63.2mL of 1.48 M sodium hydroxide is required to neutralize a 82.5mL sample of vinegar, what is the molarity of the vinegar?



4.) A standardized solution of 0.065 M HCl is titrated w/ a saturated solution of calcium hydroxide to determine its molarity and its solubility. It takes 25.0 mL of base to neutralize 10.0mL of the acid. Write the balanced molecular equation




3.) Vinegar (HC2H3O2) reacts with sodium hydroxide in a neutralization reaction.

Answer 1

3KOH + H3PO4 -> K3PO4 + 3H2O

vol. of KOH soln. = (0.0678*0.645) /(4*3) l = 0.0036 l

Molarity of vinegar = 63.2*1.48/82.5 = 1.134

Ca(OH)2 + 2HCl -> CaCl2 + 2H2O