Question

29. a,b,c

The following plot shows the pH curves for the titrations of various acids by 0.10 M NaOH (all of the acids were 50.0-mL samples of 0.10 M concentration). 12.0 10.0 8.0 6.0 4.0 2.0 0 10 20 30 40 50 60 Vol 0.10 M NaOH added (mL) a. Which pH curve corresponds to the weakest acid? b. Which pH curve corresponds to the strongest acid? Which point on the pH curve would you examine to see if this acid is a strong acid or a weak acid (assuming you did not know the initial concentration of the acid)? c. Which pH curve corresponds to an acid with Ka 1 x 10-6? The following plot shows the pH curves for the titrations of various acids by 0.10 M NaOH (all of the acids were 50.0-mL samples of 0.10 M concentration) 12.0 10.0 4.0 0 10 20 30 40 50 60 Vo 0.10 M NaOH added (mL) curve corresponds to the weakest acid? a. Which pH acid a acid b acid c acid d acid e acid f urve corresponds to the strongest acid? t on the pH curve would you examine to see if this acid is a strong acid or a weak acid (assuming you did not know the initial concentration of the acid)? c. W h pH curve corresponds to an acid with K 1 x 10 62 The following plot shows the pH curves for the titrations of various acids by 0.10 M NaOH (all of the acids were 50.0-mL samples of 0.10 M concentration). 12.0 10.0 8.0 6.0 4.0 2.0 、 0 10 20 30 40 50 60 Vol 0.10 M NaOH added (mL) a. Which pH curve corresponds to the weakest acid? b. Which pH curve corresponds to the strongest acid? Which point on the pH curve would you examine to see if this acid is a strong acid or a weak acid (assuming you did not know the initial concentration of the acid)? starting point halfway point equivalence point sponds to an acid with Ka 1 × 10-6?

Answer 1

ANSWER :

a)

The weakest acid has the largest pH value.

So, a has the largest pH value so, its the weakest.

b)

Acid dissociates as -

HA -> H+ + A-

Ka = [H+][A-]/[HA]

Higher the Ka value higher is the H+ concentration and the lesser its pH value,

so, f is the acid with lowest pH and thus the highest Ka value.

c)

So, acid f is the strongest acid.

d)

All acids have the same equivalence because in the presence of strong acid like NaOH all will behave like acid and at the equivalence point we will have equal no. of moles of acid and base in the solution

So, moles of acid = moles of NaOH (As acids are monoprotic)

M1V1 = M2V2 (moles = molarity*volume)

Where M1 . M2 is the molarity of the acid,base and V1, V2 are the volume of acid and base

So, V1 = M2V2/M1

If M2,V2 and M1 is same then V1 will also be the same for each acid

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Answer 2

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