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For your final answer (if asked for pH), you want to have the least number of sig figs for the value past the decimal point. E.g. you are given 0.015M of something and that is the least number of sig figs. Your answer would be need two sig figs past the decimal point, e.g. 3.00
Only the numbers after the decimal matter when determining the number of significant figures to add. For example, if two sig figs are used in the question, then the answer should have two significant figures AFTER the decimal (ex: 5.41).
I believe that it is two sig figs after the decimal place because pH + pOH = 14.00. Because, the sig fig rules for addition and subtraction indicate that your result can only be as accurate as the least precise digit, there are two sig figs after the decimal point.
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