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Succinic acid is titrated with different amount of NaOH . What is resulting pH?, assignment help

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(1) It takes 56 ml of 0.012 M NaOH to titrate 50 ml of succinic acid to the second equivalence point. What is the concentration of succinic acid?

(2) A solution of succinic acid is titrated with NaOH. During the titration, 15 ml of a 0.1M NaOH was added to 10 ml of a 0.1 M succinic acid. What is the pH of resulting solution?

The answer is (1) 0.0067 M; (2) 5.6 respectively, but I don't understand how to get these results.

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succinic acid HO HOOC-CH2-CH2-COOH 6.9 x 10 0-5 -6 2.5 x 10 ОН C4H604 HO succinic acid C4H604 HOOC-CH2-CH2-COOH 0-5 6.9 x 10 -6 2.5 x 10 ОН
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Explanation & Answer

) It takes 56 ml of 0.012 M NaOH to titrate 50 ml of succinic acid to
the second equivalence point. What is the concentration of succinic
acid?Moles of NaOH= 0.012*1000/56=0.2143Succinic acid is diprotic acid hence can be represented as H2AReaction is H2A+2NaOH-Na2A+2H2Omole ratio ...

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