Q. 25.0( 2 Votes )
Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that.
A. Solid X is sodium hydroxide and the gas evolved is CO2,
B. Solid X is sodium bicarbonate and the gas evolved is CO2
C. Solid X is sodium acetate and the gas evolved is CO2
D. Solid X is sodium chloride and the gas evolved is CO2
When any acid reacts with metal hydrogencarbonate, the products formed are salt, carbon dioxide (CO2) and water.
Metal hydrogencarbonate + Acid → Salt + Carbon dioxide + Water
Hence, when acetic acid reacts with sodium bicarbonate (NaHCO3), a colourless and odourless of carbon dioxide gas is evolved.
When carbon dioxide gas is passed through lime water [(CaOH)2], the following reaction takes place:
i. In this reaction, when limewater comes in contact with the gas
released in the form of an effervescence, it turns milky. This is a
chemical test for carbon dioxide gas.
ii. When limewater turns milky, it is confirmed that the
effervescence is of carbon dioxide.
Rate this question :
(a) What will be the action of solution A on litmus?
(b) What will be action of solution B on litmus?
(c) Name any two substances which can give solutions like A.
(d) Name any two substances which can give solutions like B.
(e) What sort of reaction takes place when solution A reacts with solution B?Lakhmir Singh & Manjit Kaur - Chemistry
Metal polish : Dark blue
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Car battery acid : Pink
Arrange the solutions in order of their increasing pH values (starting with the one with the lowest pH).Lakhmir Singh & Manjit Kaur - Chemistry