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  4. 20 mL of 0.5 N HCl and 35 mL of 0.1 N NaOH are mixed. The resulting solution will

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Q. 20 mL of 0.5 N $ HCl $ and 35 mL of 0.1 N $ NaOH $ are mixed. The resulting solution will

MGIMS WardhaMGIMS Wardha 2014

Solution:

For 20 mL of $ 0.5\text{ }N\text{ }HCl $ $ {{N}_{1}}{{V}_{1}}=0.5\times 20=10 $ For 35 mL of $ 0.1\text{ }NaOH $ $ {{N}_{2}}{{V}_{2}}=0.1\times 35=3.5 $ $ \because $ $ {{N}_{1}}{{V}_{1}}>{{N}_{2}}{{V}_{2}} $ $ \therefore $ Solution will be acidic in nature. Due to acidic nature of solution, the colour of phenolphthatein becomes pink.