Question

Consider the titration curve below for the following questions. Hd O-NWALO VODENWA otttt 5 10 25 30 15 20 ml base added What kind of titration is this? strong acid in strong base strong base into a weak acid strong acid into a weak base weak acid and a weak base
also i need to know the first and second pka

Answer 1

From graph it is clear that pH starts at 2 means acid and slowly it is increasing indicating adding strong base. Also there are two curved points in a "S"-shape manner, so the acid is a diprotic acid.

Hence it is strong base into a weak acid type titration.

before it adopt a S-shape the flat region is half-equivalence point.

pH = pKa1 at first half-equivalence point.

pH = pKa2 at second half-equivalence point. Please have a look at following generic graph

Н.А + он" > НА" + Н,о НА" + Он A2H2O 1- |(h) он- 12 (g) A2 10 (f). (e) 8 HAIA2 (d) HA1 6 (c) Н.АНА"- (b)- (a) 2 H2A 10 15 20 mL base 25 Diprotic acid-Strong base Titration Curve The rectangles outline the two buffer ranges. The points on the graph represent the following: (a) weak acid H2A; (b) 1st midpoint so pH pK1; (C) H2A/HA1- buffer; (d) 1st equivalence point, amphiprotic HA1, (e) HA1-/A2- buffer, () 2nd midpoint so pH pK2 (g) 2nd equivalence point, weak base A2 and (h) strong base solution 30 нd

I am predicting approximate pKa values, please check on your graph by pointing cursor to get exact value.

Consider the titration curve below for the following questions. 14 12 11 10 8 6.5 7 3.5 4 3 2 0 5 10 15 30 mL base added What kind of titration is this? ngeedinetrongbse strong base into a weak acid straneacidinteaweakbse 25 20 LO 3210

from graph pKa1 = 3.5 & pKa2 = 6.5 (may not be exact due to visual prediction)

Hope this helped you!

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