Question

What is the molarity of a MnO4- solution if 23.5 mL of this solution is required to react completely with 30.0 mL of 0.134 M Fe2+ solution according to the equation 5Fe2+(aq) + MnO4-(aq) + 8H+(aq) --> 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)

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Answer 1

Question #58432, Chemistry / General Chemistry

What is the molarity of a MnO4- solution if 23.5 mL of this solution is required to react completely with 30.0 mL of 0.134 M Fe2+ solution according to the equation 5Fe2+(aq) + MnO4-(aq) + 8H+(aq) --> 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)

Answer

$$\begin{array}{l} C_{1} \cdot V_{1} = C_{2} \cdot V_{2} \\ C_{x} \cdot 23.5 = 0.134 \cdot 30 \\ C_{x} = \frac{0.134 \cdot 30}{23.5} = 0.171 \, \text{M} \\ 5 \text{mole} \text{Fe}^{2+} : 1 \text{mole} \text{MnO}_{4}^{-} \\ C_{M} \left(\text{MnO}_{4}^{-}\right) = \frac{0.171}{5} = 0.0342 \, \text{M} \\ \text{Answer: } [C] = 0.0342 \, \text{M} \\ \end{array}$$

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