To solve this problem, we need to use the balanced chemical equation for the reaction between HCl and NaOH, which is HCl + NaOH → NaCl + H2O. We can see from the equation that the stoichiometry is 1:1, meaning that 1 mole of HCl reacts with 1 mole of NaOH. Therefore, the number of moles of HCl needed is equal to the number of moles of NaOH given. We can use the formula M = moles/volume to find the volume of the HCl solution needed. Rearranging the formula, we get volume = moles/M. Plugging in the values, we get volume = 0.150 mol / 0.200 M = 0.750 L. Since we have 25mL of NaOH, we need to multiply 0.750 L by 25 mL NaOH /1000 mL. Therefore, the answer is 0.01875 L = 18.75 mL.

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