Aluminum hydroxide is a base that is the active ingredient in some over-the-counter antacids. Suppose you have 27.0mL of 0.100M HCl solution in a flask and you add an antacid tablet to the HCl. After allowing the antacid to react with the HCl solution, you titrate the solution with 0.20 M NaOH. It requires 8.45 mL of NaOH to reach the endpoint.
How many moles of HCl were neutralized by the antacid tablet?

Find the number of moles neutralized by the antacid, not just the number of moles of acid that remain once the antacid has reacted