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A sample of 100 mL of a solution of a we...

A sample of 100 mL of a solution of a weak monoprotic acid of unknown concentration is titrated with `0.500 M NaOH` to give the titration curve shown. All of the statements are correct except:

A

Phenolphthalein would be a suitable indicator for this titration

B

A buffer solution is formed when 15 mL of `NaOH` is added

C

The `pK_(a)` of the acid is 4.0

D

The initial concentration of the acid is `0.10M`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • A volume of 50.00 mL of a weak acid of unknown concentration is titrated with 0.10 M solution of NaOH . The equivalence point is reached after 39.30 mL of NaOH solution has been added. At the half-equivalence point (19.65 mL) , the pH is 4.85 . Thus, initial concentration of the acid and its pK_(a) values are

    A
    `[HA]` initial `=0.1 M`, `pK_(a)=4.85`
    B
    `[HA]` initial `=0.079 M`, `pK_(a)=2.93`
    C
    `[HA]` initial `=0.1 M`, `pK_(a)=3.70`
    D
    `[HA]` initial `=0.079 M`, `pK_(a)=4.85`

  • 0.03 M aqueous solution of a weak monobasic acid solution (K_(a)=10^(-12)) is titrated against a 0.01M NaOH solution. What is the [H^(+)] at the end point?

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    B
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    C
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    D
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  • Acetic acid is titrated with NaOH solution. Which of the following statement is correct for this titration?

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    Conductance increases upto equivalence point, then it decrease
    B
    Conductance increases upto equivalnce point, then it increases.
    C
    First conductance increases slowly upto equivalence point and then increases rapidly.
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