MHT CET Chemistry question
A solution contains and . 10 mL of the solution required 2.5 mL of 0.1 for neutralization using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of 0.2 was required. The amount of in 1 litre of the solution is:
Answer: (A)
Solution
The phenolphthalein end point converts Na₂CO₃ to NaHCO₃: 2.5 mL × 0.2 N = 0.5 meq, so 0.5 mmol Na₂CO₃ per 10 mL = 50 mmol L⁻¹ = 5.3 g; the methyl orange step uses 2.5 × 0.4 = 1.0 meq
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