**Step 1. **number of moles of morphine reacted with HCl assuming 1:1 stoichiometric ratio.

$\mathbf{M}\mathbf{=}\frac{\mathbf{mol}}{\mathbf{L}}\phantom{\rule{0ex}{0ex}}\mathbf{mol}\mathbf{=}\left(M\right)\left(L\right)\phantom{\rule{0ex}{0ex}}\mathbf{mol}\mathbf{=}(0.0100\frac{\mathrm{mol}\mathrm{HCl}}{\overline{)L}})(2.84\overline{)\mathrm{mL}}\times \frac{{10}^{-3}\overline{)L}}{1\overline{)\mathrm{mL}}})$

You may want to reference (Pages 148 - 153)Section 4.6 while completing this problem.

A mysterious white powder is found at a crime scene. A simple chemical analysis concludes that the powder is a mixture of sugar and morphine (C_{17}H_{19}NO_{3}), a weak base similar to ammonia. The crime lab takes 10.00 mg of the mysterious white powder, dissolves it in 100.00 mL water, and titrates it to the equivalence point with 2.84 mL of a standard 0.0100 M HCl solution. What is the percentage of morphine in the white powder?

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