Volumetric Problems in Redox Reactions (Leaving Cert Chemistry): Quizzes

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Volumetric Problems in Redox Reactions
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What is tracked in redox titrations instead of proton transfer?

Electron transfer

In the formula V1×M1n1=V2×M2n2V_1 \times \frac{M_1}{n_1} = V_2 \times \frac{M_2}{n_2}, what does n1n_1 represent?

Moles of oxidising agent from equation

In MnO4−+8H++5Fe2+→Mn2++5Fe3++4H2O\text{MnO}_4^- + 8\text{H}^+ + 5\text{Fe}^{2+} \rightarrow \text{Mn}^{2+} + 5\text{Fe}^{3+} + 4\text{H}_2\text{O}, what is the mole ratio?

1 mole MnO₄⁻ : 5 moles Fe²⁺

What units should volumes be in when using the redox titration formula?

cm³

What is needed to convert concentration from moles/L to g/L?

Relative molecular mass

What should always be done first when solving redox volumetric problems?

Write the balanced equation

Where do the mole ratios n1n_1 and n2n_2 come from?

The balanced chemical equation

What must be identified for each substance in a redox reaction?

Which is oxidising & which is reducing

In Worked Example 15.1, if M2=0.12M_2 = 0.12 M and V2=25V_2 = 25 cm³ with n2=5n_2 = 5, what is V2×M2n2V_2 \times \frac{M_2}{n_2}?

0.6

To which type of titration calculations does the general formula apply?

All redox titration calculations

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