Help, I need to know how to do these problems! 1. How many grams of Mg(OH)2 (subscript 2, just in case) will be needed to neutralize 25 mL of stomach acid if stomach acid is 0.10 M HCl? 2 How many mL of a 0.10 NaOH solution are needed to neutralize 15 mL of 0.20 M H3PO4 (subscripts) solution? Thanks in advance!