A solution is prepared by dissolving 20 mL of pure hydrogen peroxide in enough water to make 200 mL of solution. What is the concentration of the hydrogen peroxide solution?
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A solution is prepared by dissolving 50 mL of hydrogen peroxide in enough water to make 2500 mL of solution. What is the concentration of the hydrogen peroxide solution?
Sri K.
Dilute aqueous hydrogen peroxide is used as a bleaching agent and for disinfecting surfaces and small cuts. Its concentration is sometimes given as a certain number of "volumes hydrogen peroxide," which refers to the number of volumes of $\mathrm{O}_{2}$ gas, measured at STP, that a given volume of hydrogen peroxide solution will release when it decomposes to $\mathrm{O}_{2}$ and liquid $\mathrm{H}_{2} \mathrm{O}$ . How many grams of hydrogen peroxide are in 0.100 $\mathrm{L}$ of "20 volumes hydrogen peroxide" solution?
The concentration of hydrogen peroxide in a solution is determined by titrating a $10.0$ -mL sample of the solution with permanganate ion. $$ \begin{array}{r} 2 \mathrm{MnO}_{4}^{-}(a q)+5 \mathrm{H}_{2} \mathrm{O}_{2}(a q)+6 \mathrm{H}^{+}(a q) \longrightarrow \\ 2 \mathrm{Mn}^{2+}(a q)+5 \mathrm{O}_{2}(g)+8 \mathrm{H}_{2} \mathrm{O}(l) \end{array} $$ If it takes $14.8 \mathrm{~mL}$ of $0.134 \mathrm{M} \mathrm{MnO}_{4}^{-}$ solution to reach the equivalence point, what is the molarity of the hydrogen peroxide solution?
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