How to do this titraition equation from Chemistry: level grade 12?

Magnesium hydroxide is the active ingredient in the antacid, Milk of Magnesia. How many grams of magnesiumj hydroxide would be required to change the pH of 65mL of stomach acid, HCL, from 0.90 to 1.50???



thanksHow to do this titraition equation from Chemistry: level grade 12?
[H+] = 10^-0.90 = 0.126

moles H+ = 0.126 M x 0.065 L = 0.0082



[H+]= 10^-1.50 = 0.0316 M

moles H+ = 0.0316 M x 0.065 L = 0.0021



0.0082 - 0.0021 = 0.0061



2HCl +Mg(OH)2 %26gt;%26gt; MgCl2 + 2 H2O



moles Mg(OH)2 needed = 0.0061/2 = 0.0031



Mass Mg(OH)2 = 0.0031 mol x 58 g/mol= 0.18 g