Question

The value of x is ________.

Answer 1

Correct Answer: 1.875

8H⁺ + 5Fe²⁺ + MnO ^– → 5Fe³⁺ + Mn²⁺ + 4H₂O

For 25 ml,

meq of Fe²⁺ = meq of MnO ^–

= 12.5 × 0.03 × 5

For 250 ml,

m moles of Fe²⁺ = \(12.5 \times 0.03 \times 5 \times \frac{250}{25}\)

moles of Fe²⁺ = \(\frac{18.75}{1000}\)mol

= 18.75 × 10^–3 mol

= 1.875 × 10^–2 mol

x = 1.875

Answer 2

Weight of Fe²⁺ = 1.875 × 10^–2 × 56 = 1.05 g

% purity of Fe²⁺ y = 18.75%