Home
Class 12
CHEMISTRY
Dissociation constants of benzoic acid, ...

Dissociation constants of benzoic acid, p-nitrobenzoic acid and p-hydroxybenzoic acid are `6.3xx10^(-5)`, `36xx10^(-5)" and "2.5xx10^(-5)` respectively. Explain.

Text Solution

Verified by Experts


(i) `NO_(2)` group is an electron withdrawing group and tends to stabilise the carboxylate anion more than the benzoate ion after the release of `H^(+)` ion. Thus, p-nitrobenzoic acid is a stronger acid than benzoic acid.
(ii) OH group is an electron releasing group and tends to destabilise the carboxylate anion more than benzoate ion after the release of `H^(+)` ion. Thus p-hydroxybenzoic acid is a weaker acid than benzoic acid. The relative order of of acidic strengths is , thus, justified.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CARBOXYLIC ACIDS

    DINESH PUBLICATION|Exercise SOME TYPICAL WORD PROBLEMS BASED ON CONVERSION|7 Videos

  • CARBOXYLIC ACIDS

    DINESH PUBLICATION|Exercise N.C.E.R.T. EXMPLAR PROBLEMS|22 Videos

  • CARBOXYLIC ACIDS

    DINESH PUBLICATION|Exercise QUESTIONS FROM BOARD EXAMINATIONS|67 Videos

  • BIOMOLECULES

    DINESH PUBLICATION|Exercise MATRIX - MATCH TYPE|8 Videos

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    DINESH PUBLICATION|Exercise Unit Test - 1|20 Videos

Similar Questions

Explore conceptually related problems

Dissociation constant of benzoic acid, p- nitro benzoic acid and p- hydroxy benzoic acid are 6.3 xx 10^(-5), 36 xx 10^(-5) " and ", 2.5 xx 10^(-5) respectively. Explain

Calculate the pH of a solution containing 0.1 M acetic acid and 0.1 M benzoic acid. K_(a) for CH_(3)CO OH and C_(6)H_(5)COOH are 1.8xx10^(-5) and 6.5xx10^(-5) respectively .

Knowledge Check

  • Decreasing order of acidity of p-methoxy benzoic acid (A), p-nitrobenzoic acid (B) and benzoic acid (C) is-

    A
    B,C,A
    B
    A,B,C
    C
    C,A,B
    D
    None

  • Decreasing order of acidity of p-methoxy benzoic acid (A), p-nitrobenzoic acid (B) and benzoic acid (C) is –

    A
    B, C, A
    B
    A, B, C
    C
    C, A, B
    D
    None

  • The dessociation cosntants of acetic acid and propionic acid are 1.0 xx 10^(-5) and 1.0 xx 10^(-6) respectively. The value of P^(K_(a)) (propionic acid) - P^(K_(a)) (Acetic acid) is

    A
    10
    B
    `10^(-1)`
    C
    1
    D
    `-1.0`

    • Similar Questions

    Explore conceptually related problems

    Dissociation constant (K_a) of formic acid and acetic acid are 2.5xx10^-4 and 0.5xx10^-5 respectively. The ratio of their relative strengths at the same concentration is

    The dissociation constant of monobasic acids A, B,C and D are 6 xx 10^(-4),5xx10^(-5), 3.6 xx 10^(-6) , and 7 xx 10^(-10) , respectively. The pH values of their 0.1M aqueous solutions are in the order.

    K_(a) for formic acid and acetic acid are 2.1xx10^(-4) and 1.1xx10^(-5) respectively. The relative strength of acids is:

    At a certain temperature the dissociation constants of formic acid and acetic acid are 1.8 xx 10^(-4) and 1.8 xx 10^(-5) respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution is equal to

    At certain temperature, dissociation constant of formic acid and acetic acid are 1.8xx10^(-4) and 1.8xx10^(-5) respectively. At what concentration of acetic solution, the H_93)O^(+) ion concentration is same as that in 0.001 M formic acid solution

    Home
    Profile