The pH of human small intestine is around $7.5$ and the pH of large intestine can be $5.5$ . As substances travel from the small intestine to larger intestine, what would happen to the $H^{+}$ ions concentration?

Increases

20

fold

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Increases

2

fold

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Increases

10

fold

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Increases

100

fold

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Solution

The correct option is D Increases $100$ fold
pH scale is not a linear scale like a centimetre or inch scale (in which two adjacent values have the same difference). It is a logarithmic scale in which two adjacent values increase or decrease by a factor of 10. As pH 7.5 and 5.5 differ by 2, the difference in H $^{+}$ ion concentration between them would be 10 $^{2}$ = 100.
So, the correct option is 'Increases 100 fold'.

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

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The pH of human small intestine is around 7.5 and the pH of large intestine can be 5.5. As substances travel from the small intestine to larger intestine, what would happen to the H+ ions concentration?

The pH of human small intestine is around $7.5$ and the pH of large intestine can be $5.5$ . As substances travel from the small intestine to larger intestine, what would happen to the $H^{+}$ ions concentration?