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The pK(a) of acteylsalicylic acid (aspir...

The `pK_(a)` of acteylsalicylic acid (aspirin) is `3.5`. The pH of gastric juice in human stomach is about `2-3` and the pH in the small intestine is about 8. Aspirin will be:

A

Unionised in the small intestine and in the stomach .

B

Completely ionised in the small intestine and in the stomach.

C

Ionised in the stomach and almost unionised in the small intestine.

D

Ionised in the small intestine and almost unionised in the equilibrium

Text Solution

Verified by Experts

The correct Answer is:
D
(d) Gastric juice is acidic . Hence the ionisation of aspirin is suppressed whereas small intestine has basic medium. Therefore aspirin is more ionised here.
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The pk_(a) of acetyl salicylic acid (aspirin) is 3.5. The pH of gastric juice in the human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirin will be (a) un-ionised in the small intestine and in the stomach (b) completely ionised in the small intestine and in the stomach (c) ionised in the stomach and almost un-ionised in the small intestine (d) ionised in the small intestine and almost un-ionised in the stomach

The pK_(a) of acetyl saliclyic acid (aspirin) is 3.5 . The pH of gastric juice in human stomach is about 2 - 3 and pH in the small intestine is about 8. Aspirin will be .

Knowledge Check

  • The pK_(a) of acetylsalicylic acid (aspirin) is 3.5. The pH of gastric juice in human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirine will be

    A
    Unionised in the small intestine and the stomach
    B
    Completely ionised in the small intestine and in the stomach
    C
    Ionised in the stomach and almost unionised in the small intestine
    D
    Ionised in the small intestine and almost unionised in the stomach

  • The pK_(a) for acetyl salicylic acid (aspirin) is 3.5. The pH of gastric juice in the human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirin will be

    A
    un-ionised in the small intestine and in the stomach
    B
    completely ionised in the small intestine and in the stomach
    C
    ionised in the stomach and almost un-ionised in the small intestine
    D
    ionised in the small intestine and almost un-ionised in the stomach

  • The acidic strength of saturated aliphatic carboxylic acids depends mainly upon the inductive effect of the substituent and its position w.r.t. the -COOH group. Whereas electron-donating substituents tend to decrease, electron-withdrawing substituents tend to increase the acid strength. the acid weakening effect of electron donating substituents and acid-strengthening effect of the electron-withdrawing substituents is more pronounced at p-position than that at m-position. Due to ortho effect, o-substituted benzoic acids are usually stronger than benzoic acid regardless of the nature of substituent whetehr electron-donating or electron-withdrawing Q. The pK_(a) of acetylsalicylic acid (aspirin) is 3.5 The pH of gastric juice in human stomach is about 2-3 and pH in the small intestine is about 8. Aspirin will be

    A
    Unionized in the small intestine and in the stomach
    B
    Completely ionized in the stomach and almost unionized in the small intestine
    C
    Ionised in the stomach and almost unionized in the small intestine.
    D
    Ionised in the small intestine and almost unionized in the stomach.

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