Assertion : Gas bubbles are observed when sodium carbonate is added t...
Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid as CO2 gas is released.
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Assertion : Gas bubbles are observed when sodium carbonate is added t...
Assertion: Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.
Reason: Carbon dioxide is given off in the reaction.
The correct answer is option 'A': Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A).
Explanation:
When sodium carbonate (Na2CO3) is added to dilute hydrochloric acid (HCl), a chemical reaction takes place. This reaction can be represented by the following equation:
Na2CO3 + 2HCl -> 2NaCl + H2O + CO2
In this reaction, sodium carbonate reacts with hydrochloric acid to form sodium chloride, water, and carbon dioxide gas. The carbon dioxide gas is given off as bubbles, which can be observed.
Now let's analyze the given assertion and reason:
Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.
This assertion is true. When sodium carbonate reacts with hydrochloric acid, the formation of carbon dioxide gas leads to the observation of gas bubbles.
Reason (R): Carbon dioxide is given off in the reaction.
This reason is also true. As stated earlier, the reaction between sodium carbonate and hydrochloric acid produces carbon dioxide gas as one of the products. This gas is released into the surrounding environment, resulting in the observation of gas bubbles.
Explanation:
The reaction between sodium carbonate and hydrochloric acid is a classic example of an acid-base reaction. Sodium carbonate is a base, and hydrochloric acid is an acid. When they react, the carbonate ion (CO3^2-) from sodium carbonate combines with the hydrogen ion (H+) from hydrochloric acid to form water (H2O). Simultaneously, sodium from sodium carbonate combines with chloride from hydrochloric acid to form sodium chloride (NaCl).
In addition to the formation of water and sodium chloride, carbon dioxide gas (CO2) is produced as a byproduct. The carbon dioxide gas is less soluble in water and is released as bubbles during the reaction. These bubbles can be observed as a visual indication of the gas being given off.
Conclusion:
In conclusion, the assertion that gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid is true. The reason for this observation is the production of carbon dioxide gas during the reaction. Hence, both the assertion and reason are true, and the reason correctly explains the assertion.
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