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I believe it's like calculating M2 using the M1V1=M2V2 equation. M1=0.025 and V1=0.2 L. M2=? and V2=0.25 L. In order to find M2, you divide 0.025*0.2 by 0.25, and that gives you 0.02 M. Since HCl dissociates all the way and creates H3O+ ions, we can assume that the concentration of H3O+ is also 0.02. When you plug it into the pH equation, you get 1.7.
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