# Problem: The graphs below labeled (a) and (b) show the titration curves for two equal-volume samples of monoprotic acids, one weak and one strong. Both titrations were carried out with the same concentration of strong base.What is the approximate pH at the equivalence point of (a) curve?What is the approximate pH at the equivalence point of (b) curve?Which curve corresponds to the titration of the strong acid and which one to the titration of the weak acid?

###### FREE Expert Solution

Weak acid and strong base titration

• pH gradually increases as it approaches the equivalence point
• pH at the equivalence point is more than 7.00

Strong acid and strong base titration

• pH rapidly increases as it approaches the equivalence point
• pH at the equivalence point is equal to 7.00

Part A.

The steepest point in the curve will be the equivalence point.

• This is basically the turning point in curve.
• This is usualy the middle point of the horizontal segment.
• Then we simply trace to the pH axis to identify the value.

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###### Problem Details

The graphs below labeled (a) and (b) show the titration curves for two equal-volume samples of monoprotic acids, one weak and one strong. Both titrations were carried out with the same concentration of strong base.

What is the approximate pH at the equivalence point of (a) curve?

What is the approximate pH at the equivalence point of (b) curve?

Which curve corresponds to the titration of the strong acid and which one to the titration of the weak acid?