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Equal volumes of 10% (w/v) HCl and 10% (w/v) NaOH are mixed together. The resulting solution will be:

1. basic
2. neutral
3. acidic
4. cannot be predicted

Correct answer: acidic

Solution

10% w/v = 100 g/L. Moles HCl = 100/36.5 = 2.74; moles NaOH = 100/40 = 2.50. Equal volumes give excess HCl, so the mixture is acidic.

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