A solution containing Na₂CO₃ and NaOH requires 300 ml of 0.1 N HCl using phenolpthalein as an indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in solution is ( NaOH=40, Na₂CO₃=106)

Question: A solution containing Na₂CO₃ and NaOH requires 300 ml of 0.1 N HCl using phenolpthalein as an indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in solution is ( NaOH=40, Na₂CO₃=106)

(a) 0.6 g

(b) 1.0 g

(c) 1.5 g

(d) 2.0 g

Correct Answer: (b) 1.0 g

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