The accompanying graphs shows titration curves for two monoprotic acid. a. Which

Question

The accompanying graphs shows titration curves for two monoprotic acid.
a. Which curve is that of a strong acid? Weak acid?
b. What is the approximate pH at the equivalence point for each?
c. Since the volumes of titrating base are shown as different on these two graphs, what could you say about the relative molarities of the original acid solutions? (assuming the titrating base stayed the same.)
d. If the pH values were not shown on these two graphs, what else about the graphs could you use to decide on whether it was a weak acid our strong acid titration?

Explanation / Answer

a) case B is a strong acid

     huge the quantity of base used to reach the eqivalance point when compared to case A

b) case A : pH = 7

    case B : pH = 8

c) case A ; Acid is weak ( so its molarity is considered to be low relative to the case B)

d) from the pattern of the curve / graph

case A:   quickly reached the eqivalace and graph is so symmetric, indicating acid and base are of similar

                     concentration.

       case B:   a large consumption of base and sudden jump to eqivalence and a slow saturated base plot

                      indicating that acid is strong

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