5.- The following curve corresponds to the titration of diprotic acid with sodiu

Question

5.- The following curve corresponds to the titration of diprotic acid with sodium hydroxide 74.00 12 00 10.00 o.oo 6.00 4.03 2.00 0.00 o.oo 5 5.00 1000500 2000 2500 3000 3500 4000 4500 5000 Volume of NaoH (mL) a.- Determine the 2 values of the pKa pKa1 a. 1.0 b.-3.0 c.-4.00 pKa2 a. 4.0 b. 10.0 c. 6.0 b.- Determine the pH and NaOH volume for both neutralizations points First neutralization pH- a. 6 b. 4.0 c. 6.0 Volume a. 21 b. 35 c. 15 Second neutralization pH-a, 12 b. 6 c. 8.8 Volume a. 42 b.-70 c. 35

Explanation / Answer

5.From the given titration plot,

a. pKa's are,

pKa1: b. 3.0

pKa2: a. 4.0

b. at Ist neutralization point

pH: b. 4.0

volume: a. 21 ml

at IInd neutralization point

pH: c. 8.8

volume: a. 42 ml

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