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Hard water when passed through ion excha...

Hard water when passed through ion exchange resin containing RCOOH group, becomes free from

A

`Cl^(-)`

B

`SO_(4)^(2-)`

C

`H_(3)O^(+)`

D

`Ca^(+2)`

Text Solution

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The correct Answer is:
To solve the question regarding hard water being passed through an ion exchange resin containing the RCOOH group, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Hard Water**: - Hard water is defined as water that contains high concentrations of calcium (Ca²⁺) and magnesium (Mg²⁺) ions. These ions are responsible for the hardness of the water. 2. **Source of Hardness**: - The hardness in water typically comes from the dissolution of minerals such as limestone (calcium carbonate), gypsum (calcium sulfate), or chalk, which release calcium and magnesium ions into the water. 3. **Ion Exchange Process**: - An ion exchange resin is a material that can exchange specific ions within it with ions in a solution that is passed through it. In this case, the resin contains carboxylic acid groups (RCOOH). 4. **Function of Carboxylic Acid Group**: - The carboxylic acid (RCOOH) can dissociate into RCOO⁻ (the carboxylate anion) and H⁺ (proton). The RCOO⁻ can act as a site for cation exchange. 5. **Cation Exchange**: - When hard water passes through the resin, the calcium (Ca²⁺) and magnesium (Mg²⁺) ions in the water will be exchanged with the H⁺ ions from the carboxylic acid groups in the resin. This means that the hard water will lose its calcium and magnesium ions and become soft. 6. **Conclusion**: - Therefore, when hard water is passed through the ion exchange resin containing RCOOH, it becomes free from calcium (Ca²⁺) and magnesium (Mg²⁺) ions, which are the main contributors to water hardness. ### Final Answer: Hard water when passed through ion exchange resin containing RCOOH group becomes free from **Ca²⁺ and Mg²⁺ ions**.
To solve the question regarding hard water being passed through an ion exchange resin containing the RCOOH group, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Hard Water**: - Hard water is defined as water that contains high concentrations of calcium (Ca²⁺) and magnesium (Mg²⁺) ions. These ions are responsible for the hardness of the water. 2. **Source of Hardness**: ...
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