We form 894 g of agbrs what was the initial concentration

Question

What volume (in mL) of a solution 0.160 M in Ca(OH)₂ must we use to neutralize 29.0 mL of a solution 0.337 M in H₃PO₄.  

We have 2.82 L of an aqueous NaBr solution. We add an excess of AgNO₃. We form 8.94 g of AgBr(s). What was the initial concentration of Br^- (in mol/L) in this aqueous NaBr solution?  

What is the pH of a 0.100 M solution of the acid HA if its ionization constant, K_A, is 0.32.