Question

The volume of 0.3 M ferrous ammonium sulphate solution required for the completion of redox titration with 20 mL of 0.1 M potassium dichromate solution is ............. mL.

Hint:

In titration calculations, use the equation \( M_1 V_1 = M_2 V_2 \) to find the volume of one solution required to neutralize the other, given their concentrations and the stoichiometry of the reaction.

Answer 1

Correct Answer: 40

Step 1: Understanding the redox titration.
In a redox titration, the stoichiometry between the two reacting species can be used to find the required volume of one solution. The balanced equation for the redox reaction between ferrous ammonium sulfate (Fe2+) and potassium dichromate (K2Cr2O7) tells us the molar ratio between the two substances.

Step 2: Calculating the volume.
Using the equation \( M_1 V_1 = M_2 V_2 \), where \( M_1 \) and \( V_1 \) are the concentration and volume of the ferrous ammonium sulfate solution, and \( M_2 \) and \( V_2 \) are the concentration and volume of the potassium dichromate solution, we can calculate that the volume of ferrous ammonium sulfate required is 20 mL.

Step 3: Conclusion.
The correct answer is 20 mL.