A 29.19 mL sample of the HCl solution required 21.18 mL of NaOH solution for complete reaction. What is the molarity of the HCl solution? A 0.05500 M solution of NaOH was used to titrate a solution of unknown concentration of HCl. Cola drinks are usually 0.0070M with respect toH3PO4. Determine the numbers of moles of this acid are in a 227.1mL drink?