I am first assuming that you want the molarity of the acid. Use the formula [tex]M_{a} V_{a} = M_{b}V_{b}[/tex] which is the titration formula. M is molarity (a is of acid and b is of base) and V is volume in mL (a is of acid and b is of base). Plugging in gives us [tex](29 mL)(M_{a}) = (0.130 M)(27.73 mL)[/tex]. Solving gives us [tex]M_{a} = 0.124 M[/tex]
