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Q.

20.00 mL sample of vinegar is diluted in a volumetric flask. The volumetric flask is then filled up to the line marking its designated volume. A 20.00 mL aliquot of the diluted sample of vinegar is titrated against a 0.10 M solution of potassium hydroxide, KOH, using a phenolphthalein indicator. If the undiluted sample of vinegar has a concentration of 3 % w/v acetic acid, CH3COOH, "V x 25" capacity (in mL) volumetric flask should be selected to be able to dilute the original sample of vinegar and obtain titres of about 25 mL. Find the value of V?

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answer is 4.

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Detailed Solution

0.10×25=3100×20×160×1V×1000×20V=80mL

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