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Sodium hydrogen carbonate when added to ...

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following sttements are ture about the gas evolved?
(i) It turns lime milky
(ii) It extinguishes a burining splinter
(iii) It dissolves in a solution of sodium hydroxide
(iv) It has a pungent odour.

A

(i) and (ii)

B

(i), (ii) and (iii)

C

(ii), (iii) and (iv)

D

(i) and (iv)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the gas evolved when sodium hydrogen carbonate is added to acetic acid, we will analyze each statement provided. ### Step-by-Step Solution: 1. **Identify the Reaction**: When sodium hydrogen carbonate (NaHCO₃) reacts with acetic acid (CH₃COOH), the reaction produces carbon dioxide (CO₂), water (H₂O), and sodium acetate (CH₃COONa). The balanced reaction can be written as: \[ \text{NaHCO}_3 + \text{CH}_3\text{COOH} \rightarrow \text{CH}_3\text{COONa} + \text{CO}_2 + \text{H}_2\text{O} \] Thus, the gas evolved is carbon dioxide (CO₂). 2. **Evaluate Statement (i)**: "It turns lime milky." - Carbon dioxide reacts with lime water (calcium hydroxide, Ca(OH)₂) to form calcium carbonate (CaCO₃), which is insoluble and causes the solution to turn milky. - **Conclusion**: This statement is **true**. 3. **Evaluate Statement (ii)**: "It extinguishes a burning splinter." - Carbon dioxide is a non-supporter of combustion. When a burning splinter is placed in a jar filled with CO₂, it will extinguish because CO₂ does not support combustion. - **Conclusion**: This statement is **true**. 4. **Evaluate Statement (iii)**: "It dissolves in a solution of sodium hydroxide." - Carbon dioxide can react with sodium hydroxide to form sodium carbonate (Na₂CO₃) or sodium bicarbonate (NaHCO₃). Therefore, it can dissolve in a sodium hydroxide solution. - **Conclusion**: This statement is **true**. 5. **Evaluate Statement (iv)**: "It has a pungent odour." - Carbon dioxide is a colorless and odorless gas. It does not have a pungent smell. - **Conclusion**: This statement is **false**. ### Final Answer: The true statements about the gas evolved (carbon dioxide) are: - (i) It turns lime milky. - (ii) It extinguishes a burning splinter. - (iii) It dissolves in a solution of sodium hydroxide. Thus, the correct options are (i), (ii), and (iii).
To solve the question regarding the gas evolved when sodium hydrogen carbonate is added to acetic acid, we will analyze each statement provided. ### Step-by-Step Solution: 1. **Identify the Reaction**: When sodium hydrogen carbonate (NaHCO₃) reacts with acetic acid (CH₃COOH), the reaction produces carbon dioxide (CO₂), water (H₂O), and sodium acetate (CH₃COONa). The balanced reaction can be written as: \[ \text{NaHCO}_3 + \text{CH}_3\text{COOH} \rightarrow \text{CH}_3\text{COONa} + \text{CO}_2 + \text{H}_2\text{O} ...
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