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Reaction of Acids with Metals

Why should cu...

Question

Why should curd and other sour foodstuffs (like lemon juice, etc.) not be kept in metal containers (such as copper and brass vessels)?

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Solution

Curd and other foodstuffs (such as lemon juice) are acidic in nature. Acids react with metals to give hydrogen gas. Hence, when these acidic foodstuffs are kept in metal containers, hydrogen gas is liberated, and it spoils the food and makes it inedible.

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Q. Metals with Acids

Most of the acids react with metals to form salts and evolve hydrogen gas.

Metal + Acid → Salt + Hydrogen gas

Curd and other sour foodstuffs such as vinegar, lemon juice, orange juice, etc. should not be kept in metal vessels (like copper vessels or brass vessels). This is because curd and other sour foodstuffs contain dilute acids which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and damage our health.

To store foodstuffs which contain dilute acids, we can use vessels made of stainless steel. Stainless steel is an alloy of iron, nickel, and chromium. It is hard, does not rust, and does not react with dilute acids.

Reaction of metals with acids is a type of:

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Q. Question 1
Why should curd and sour substances not be kept in brass and copper vessels?

Why should the foodstuffs like orange juice,pickles,chutney and curd not be kept in iron or aluminium containers ?

Why should curd or any sour substance not be kept in brass and copper vessels?

Q. Question 1
Why should curd and sour substances not be kept in brass and copper vessels?

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