(i) Why should curd and sour substance not be kept in brass and copper vessels?
(ii) What are the differences between the properties of acids and bases?
(i) Why should curd and sour substance not be kept in brass and copper vessels?
(ii) What are the differences between the properties of acids and bases?
(i) Brass and copper are metals. When sour substances like curd are kept in brass or copper vessels, the lactic acid in curd reacts with the metals that lead to the corrosion of the vessels as well as the formation of harmful salts that cannot be consumed.
(ii) Properties of Acids
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Acids do not have a soapy touch
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Acids substances release hydrogen ions when dissolved in water
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Their pH values are always less than 7
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Acids are sour-tasting substances
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Acids change blue litmus red.
Properties of Bases
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They are found to have a soapy nature
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These substances release hydroxide ions when dissolved in water
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Their pH values are always greater than 7
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They are bitter tasting substances.
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Bases turn red litmus blue.
(i) Brass and copper are metals. When sour substances like curd are kept in brass or copper vessels, the lactic acid in curd reacts with the metals that lead to the corrosion of the vessels as well as the formation of harmful salts that cannot be consumed.
(ii) Properties of Acids
-
Acids do not have a soapy touch
-
Acids substances release hydrogen ions when dissolved in water
-
Their pH values are always less than 7
-
Acids are sour-tasting substances
-
Acids change blue litmus red.
-
They are found to have a soapy nature
-
These substances release hydroxide ions when dissolved in water
-
Their pH values are always greater than 7
-
They are bitter tasting substances.
-
Bases turn red litmus blue.
