Question

What are the final hydrogen ion concentration and pH of a solution obtained by mixing 250...

What are the final hydrogen ion concentration and pH of a solution obtained by mixing 250 mL of 0.1M Citric Acid with 300 mL of 0.1M KOH? pKa's are: 3.06, 4.74, and 5.40.

The answer is [H+] = 7.25*10^-5 M. and pH = 4.14.... please explain in detail!!!

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Answer #1

Citric acid is a weak organic tricarboxylic acid. Citric acid has three carboxylic acid groups, three ionizable, acidic hydrogen atoms and three Ka/pKa values. The neutralization reaction with KOH has 3 to 1 stoichiometry as illustrated by the balanced complete neutralization equation.

Given that

250 ml of 0.1M citric acid. Concentration of acid

300 ml of 0.1 M KOH. Concentration of base

To determine Hydrogen ion concentration

When we look at the value of pKa ;

We will take average of to calculate its pH.

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