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A sample of carbonic acid (0.125 L, 0.199 M, pKa1 = 6.35, pKa2 = 10.33) was...

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Chemistry

A sample of carbonic acid (0.125 L, 0.199 M, pKa1 =6.35, pKa2 = 10.33) was titrated with 1.75 M NaOH.Calculate the pH at the following points:

Before the titration.

At the 1st midpoint.

Answer & Explanation Solved by verified expert
4.1 Ratings (537 Votes)
1 Before titration pH of carbonic acid First write out the equilibrium expression and use the ICE method H2CO3 H2O H3O HCO3 Initial 0199 M 0 0 Change x x x Equilibrium 0199 x x x Next set up the Ka expression and using your given value of Ka1 solve for x Ka H3OHCO3 H2CO3 43 x 107 Water is not included in the expression because it is a liquid Remember when solving for an    See Answer
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