What was the initial concentration of br- in moll in this

Question

Question 1: What volume (in mL) of a solution 0.183 M in Ca(OH)₂ must we use to neutralize 28.7 mL of a solution 0.385 M in H₃PO₄. 

Question 2: We have 2.80 L of an aqueous NaBr solution. We add an excess of AgNO₃. We form 9.53 g of AgBr(s). What was the initial concentration of Br^- (in mol/L) in this aqueous NaBr solution? 

Question 3: What is the pH of a 0.109 M solution of the acid HA if its ionization constant, K_A, is 0.39.