Part A: Titration of H:M with NaOH Consider the titration curve for H2M and thin

Question

Part A: Titration of H:M with NaOH Consider the titration curve for H2M and think about what reactions are occurring during the titration process. Write the Net lonic Equation: a) the neutralization reaction (aka titration reaction) occurring up to the first equivalence point. b) the equilbrium reaction involving the conjugate pair and water occurring up to the first equivalence point. c) the neutralization reaction (aka titration reaction) between the first equivalence point and the second equivalence point. d) the equilibrium reaction involving the conjugate pair and water between the first equivalence point and the second equivalence point. e) the overall neutralizations reaction (akatitration reaction) that occurs between the first drop of titrant to the second equivalence point.

Explanation / Answer

Part A) Titration of diprotic acid H2A with NaOH

a) Neutralization reaction at first equivalence point

H2A + NaOH --> NaHA + H2O

b) reaction of conjugate base and water at Ist neutralization point

HA- + H2O <==> H2A + OH-

c) between first and second equivalence points

H2A --> 2H+ + A^2-

d) at the second equivalence point

A^2- + H2O <==> HA- + OH-

e) Overall neutralization reaction,

H2A + 2NaOH --> Na2A + 2H2O

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