A 0.5895g sample of impure magnesium hydroxide is dissolved in 100.0ml of a 0.2050M HCl solution the excess acid then needs 19.85ml of 0.1020M NaOH for neutralization calculate the percentage by mas?

To calculate it must be certain that the impurities do NOT react either with HCl or NaOH; hence they shouldn't be acidic or base compounds.

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