Which gas is evolved when metal carbonate or metal hydrogen carbonate react with dilute acids. How will you test this gas??
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Answers
Answer:
Which gas is evolved when metal carbonate or metal hydrogen carbonate react with dilute acid? How will you test this gas?
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When any dilute acid reacts with any carbonate or
bicarbonate carbon dioxide gas is evolved
Na2CO3 + 2HCl——2NaCl +H2O+CO2
How to test the gas evolved—-
Carry out the reaction in a broad test tube Use a rubber stopper with a tube fitted in it
Add the reactants and place the stopper immediately
Allow the gas to pass through limewaterThe limewater
turns milky This indicates that the gas evolved is
Carbon dioxide
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CO2 gas evolves and it can be tested by lime water test..... As it turns lime water milky...
Carbon dioxide is evolved. You can test for it using wet pH paper over the evolved gas stream.
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Why is hydrogen gas produced when a metal reacts with dilute acid?
CO2 TURNS LIME WATER MILKY
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Explanation:
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When metal carbonate or metal hydrogen carbonate reacts with dilute acids, carbon dioxide (CO₂) gas will evolve.
When Na₂CO₃ reacts with HCl, the products will be NaCl, H₂O, CO₂;
+
——
+ H₂O + CO₂
If we allow the gas through lime water, the lime water will turn milky. This proves that the evolved gas is CO₂.