The graph above shows the titration curves of four monoprotic acids of varying s
ID: 499864 • Letter: T
Question
The graph above shows the titration curves of four monoprotic acids of varying strengths. All of the acids start out at 0.1 M concentration and 25.0 mL volume. Choose all of the correct statements about these titration curves from the choices below.
The titration curve labelled "D" is generated by the strongest acid in the series.
The pKa values of acids "A" - "C" are their pH values at 0 mL of NaOH.
The weaker the acid the lower its pH value at the beginning of the titration.
The pKa of a titration indicator should match the pKa of the acid being titrated.
The pKa values of acids "A" - "C" are their pH values at 25.0 mL of NaOH.
The Ka of the acid which generates curve "C" is about 10-3.
Explanation / Answer
The correct statements are
The curve D is the strngest acid. as it has the lowest pH at the starting point.
other statements are qorng as
ii) At 0 volume the pH of acid not Pka but, pH = 1/2 [pka -logC]
iii)The weaker the acid , the hihger is the pH at the beginning not lower.
iV)the pKa of indicator should match the pH at the equivalence not the pKa of acid.
v) At 25mL, the equivalence point is reached where the pH is higher than their pKa values.
vi) The ka of acid that genrates c is not 10-3.If it we 10-3 , the pH at beginning can not be2.5
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