Chemistry - Redox Reactions Question with Solution | TestHub
Match each solution in Column I with the solution(s) in Column II needed for complete reaction.
Column I | Column II |
|---|---|
A) 50 ml of 0.5 M - Na₂CO₃ solution using methyl orange indicator | P) 50 ml of 0.5 M - H₂SO₄ solution |
B) 50 ml of 0.5 M - Na₂CO₃ solution using phenolphthalein indicator | Q) 50 ml of 0.5 M - HCl solution |
C) 50 ml of 0.5 M - NaHCO₃ solution using methyl orange indicator | R) 25 ml of 0.5 M - H₂SO₄ solution |
D) 50 ml of 0.5 M - NaOH solution using phenolphthalein indicator | S) 50 ml of 1.0 M - HCl solution |
Options:
Answer:
Solution:
Column II equivalents: P = 0.025 mol H₂SO₄ x 2 = 0.05 eq; Q = 0.025 mol HCl = 0.025 eq; R = 0.0125 mol H₂SO₄ x 2 = 0.025 eq; S = 0.05 mol HCl = 0.05 eq. (A) 0.025 mol Na₂CO₃ with methyl orange goes to H₂CO₃: 2 eq per mole = 0.05 eq, so P and S. (B) With phenolphthalein Na₂CO₃ stops at NaHCO₃: 1 eq per mole = 0.025 eq, so Q and R. (C) 0.025 mol NaHCO₃ with methyl orange takes 1 H⁺ per mole: 0.025 eq, so Q and R. (D) 0.025 mol NaOH: 0.025 eq, so Q and R.
