A 0.5895 g sample of impure magnesium hydroxide is dissolved in 100.0 mL of 0.2050 M HCl solution. The excess acid then needs 19.85 mL of 0.1020 M NaOH for neutralization . Calculate percentage by mass of magnesium hydroxide in the sample assuming that it is the only substance reacting with HCl solution.

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Q: impure

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