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A mixture of a 5 mL sample solution of HCI and 2 drops of phenolphthalein turns pink on the addition of 2 drops of 1 M NaOH solution to it. Find the concentration and grams of HCI in the given sample solution. (100 drops of 1 M NaOH is found to be equivalent to 6 mL)

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Volume of NaOH = 6 x 2/100 = 0.12 mL

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