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Oesophagus & Stomach

How is sodium...

Question

How is sodium hydrogen carbonate used as an antacid?

A

It forms sodium carbonate

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B

It increases the pH of the stomach

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C

It neutralises the excess base in the stomach

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D

It neutralises the excess acid in the stomach

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Solution

The correct option is D
It neutralises the excess acid in the stomach

Sodium hydrogen carbonate is basic. It reacts with excess acid in the stomach and neutralises it.

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The chemical substances which neutralise the excess of acid generated in stomach and maintain the normal pH value are called analgesics.

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The chemical substances, which neutralise the excess of acid generated in stomach and maintain the normal pH value are called laxatives.

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Stomach acid, a dilute solution of

H C l

in water can be neutralised by reaction with sodium hydrogen carbonate.

N a H C O_{3} (a q) + H C l (a q) ⟶ N a C l (a q) + H_{2} O (l) + C O_{2} (g)

How many millilitres of

0.125 M

N a H {C O}_{3}

solution are needed to neutralize

18.0 m l

0.100 M

H C l

Q. HCl is produced in the stomach which can be neutralised by

M g (O H)_{2}

in the form of milk of magnesia. How much

M g (O H)_{2}

is required to neutralise one mole of stomach acid?

Q. Assertion :Magnesium hydroxide is a better antacid than sodium hydrogencarbonate. Reason: Magnesium hydroxide being insoluble, it does not allow pH to increase above neutral, whereas hydrogen carbonate being soluble, its excess can make the stomach alkaline and trigger the production of even more acid.

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