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Chemistry-

General

Easy

Question

The pH of a solution obtained by mixing 50 ml of 0.4 M HCl and 50 ml of 0.2 M NaOH would be

1
3
4
2

The correct answer is: 1

Millimoles of HCl added = 50 ´ 0.4 = 20
Millimoles of NaOH added = 50 ´ 0.2 = 10
Molarity of HCl left = $fraction numerator 10 over denominator 100 end fraction$ = 0.1
pH = 1

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