The accompanying graph shows the titration curves for two monoprotic acids. (a) Which curve is that of a strong acid? (b) What is the approximate pH at the equivalence point of each titration? (c) 40.0 mL of each acid was titrated with 0.100 M base. Which acid is more concentrated? (d) Estimate the pK_a of the weak acid.

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Jarrod RobelLv2

20 May 2020

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61. The graphs 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 concen- tration of strong base. pH pH pH TTTTTTT NO TTTTTTT 0 0 20 40 60 80 100 Volume of base added (mL) = 0 20 40 60 80 100 Volume of base added (mL) (b) (i) What is the approximate pH at the equivalence point of each curve? (ii) Which graph corresponds to the titration of the strong acid and which one to the titration of the weak acid?

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