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25 ml of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30 mL of 0.2 M aqueous NaOH solutions ?

1. 50 mL
2. 12.5 mL
3. 25 mL
4. 75 mL

Correct answer: 25 mL

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