20.4 g of KHP (KC8H5O4) is dissolved in water, giving a solution with a mass of 118.4 g. A solution of sodium hydroxide is also prepared. 4.4 g of this sodium hydroxide solution reacts completely with 5.8 of the KHP solution above. Sodium hydroxide reacts in a 1:1 mole ratio with KHP. In a similar reaction, 4.4 g of the sodium hydroxide solution reacts completely with a 5.9 g sample of vinegar (containing acetic acid, CH3COOH). Sodium hydroxide reacts in a 1:1 mole ratio with acetic acid. Calculate the percentage by mass of acetic acid present in the vinegar sample.[Molar mass of KHP=204, NaOH=40 and CH3COOH=60]

Question

20.4 g of KHP (KC8H5O4)  is dissolved in water, giving a solution with a mass of 118.4 g. A solution of sodium hydroxide is also prepared. 4.4 g of this sodium hydroxide solution reacts completely with 5.8 of the KHP solution above. Sodium hydroxide reacts in a 1:1 mole ratio with KHP. In a similar reaction,  4.4 g of the sodium hydroxide solution reacts completely with a 5.9 g  sample of vinegar (containing acetic acid,  CH3COOH). Sodium hydroxide reacts in a 1:1 mole ratio with acetic acid. Calculate the percentage by mass of acetic acid present in the vinegar sample.[Molar mass of KHP=204, NaOH=40 and CH3COOH=60]

Infinity Learn · Accepted Answer

wKHPin 5.8 g soln = 20.4118.4×5.8⇒nKHP=20.4118.4×5.8204=nNaOH=nAcOH ⇒wAcOH=20.4118.4×5.8204×60⇒%AcOH=20.4118.4×5.8204×605.8×100=5

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