Recall that at the equivalence point of a titration:
Also, recall that moles = molarity × volume.
There are 2 equivalence points:
moles base = moles acid - moles HClexcess (2nd equiv.)
For 1st equiv. point:
A 0.5890 g sample of impure magnesium hydroxide is dissolved in 103.0 mL of 0.2040 M HCl solution. The excess acid then needs 19.88 mL of 0.1036 M NaOH for neutralization.
Calculate the percent by mass of magnesium hydroxide in the sample, assuming that it is the only substance reacting with the HCl solution. Express your answer using four significant figures.
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