What is the pH of a solution with 010M of HBr and 009 M NaOH

Solution

HBr is strong acid and mono basic acid

NaOH is also strong base and mono acidic base

one equivelent of base will react and give you the one equivqlent os acid

0.09M react with 0.09M of HBr so 0.01M HBr remaining

pH of HBr = -log[concentration of HBr]

= -log[0.01]

= 2