The $p K_{a}$ of acetylsalicyclic acid (asprin) is $3.5$ . The pH of gastric juice in human stomach is about 2-3 and the pH in the small intestine is about $8$ . Asprin will be:

Unionised in the small intestine and in the stomach

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Completely ionised in the small intestine and in the stomach

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Ionised in the stomach and almost unionised in the stomach

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Ionised in the small intestine and almost unionised in the stomach

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Solution

The correct option is C Ionised in the small intestine and almost unionised in the stomach
Applying the equation
$p H = log \frac{[S a l t]}{[B a s e]} + p K_{a}$
In human stomach suppose $p H$ is 3 so $3 = log \frac{[S a l t]}{[B a s e]} + 3.5$
$log \frac{[S a l t]}{[B a s e]} = 0.5$ so it almost unionised in stomach.
In small intestine $p H$ is 8 so $8 = log \frac{[S a l t]}{[B a s e]} + 3.5$
$log \frac{[S a l t]}{[B a s e]} = 5.5$ so it is ionised in intestine.

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Question 4
Which is the correct sequence of parts in a human alimentary canal?

(a) $M o u t h \to s t o m a c h \to s m a l l i n t e s t i n e \to o e s o p h a g u s \to l a r g e i n t e s t i n e$
(b) $M o u t h \to o e s o p h a g u s \to s t o m a c h \to l a r g e i n t e s t i n e \to s m a l l i n t e s t i n e$
(c) $M o u t h \to s t o m a c h \to o e s o p h a g u s \to s m a l l i n t e s t i n e \to l a r g e i n t e s t i n e$
(d) $M o u t h \to o e s o p h a g u s \to s t o m a c h \to s m a l l i n t e s t i n e \to l a r g e i n t e s t i n e$

Which of the following is the correct sequence of parts as they occur in the human alimentary canal ?

(a) Mouth $\to$ Stomach $\to$ Small intestine $\to$ Oesophagus $\to$ Large intestine
(b) Mouth $\to$ Oesophagus $\to$ Stomach $\to$ Large intestine $\to$ Small intestine
(c) Mouth $\to$ Stomach $\to$ Oesophagus $\to$ Small intestine $\to$ Large intestine
(d) Mouth $\to$ Oesophagus $\to$ Stomach $\to$ Small intestine $\to$ Large intestine

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The pKa of acetylsalicyclic acid (asprin) 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. Asprin will be:

The $p K_{a}$ of acetylsalicyclic acid (asprin) is $3.5$ . The pH of gastric juice in human stomach is about 2-3 and the pH in the small intestine is about $8$ . Asprin will be: