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Which of the following cations impart(s) pseudo hardness to water?
- a)Calcium only
- b)Magnesium only
- c)Calcium and magnesium
- d)Sodium
Correct answer is option 'D'. Can you explain this answer?
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Which of the following cations impart(s) pseudo hardness to water?a)Ca...
Monovalent cations impart pseudo-hardness. Hardness is the concentration of multivalent cations.
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Which of the following cations impart(s) pseudo hardness to water?a)Ca...
Pseudo Hardness in Water
Pseudo hardness in water refers to the presence of certain cations that can contribute to the perception of hardness, even though they do not cause the formation of scale or interfere with the lathering of soap. These cations are typically sodium (Na+) and potassium (K+).
Explanation
Calcium and Magnesium
Calcium (Ca2+) and magnesium (Mg2+) are the primary contributors to the hardness of water. When water contains high concentrations of these cations, it is classified as hard water. Hard water can cause scaling in pipes, reduce the effectiveness of soaps and detergents, and leave behind residue on fixtures and surfaces.
Sodium
Sodium, on the other hand, does not contribute to the hardness of water. It is a monovalent cation (Na+) and does not form insoluble compounds with anions such as carbonate and sulfate, which are responsible for the formation of scale in hard water.
Pseudo Hardness
While sodium does not cause the typical problems associated with hard water, it can still impart a perception of hardness due to its high ionic strength. The presence of sodium ions in water can affect the taste and feel of the water, making it seem harder than it actually is.
Conclusion
In the given options, only option D (Sodium) is correct. While calcium and magnesium are the primary contributors to water hardness, sodium can impart pseudo hardness to water due to its high ionic strength. Therefore, option D is the correct answer.
Pseudo hardness in water refers to the presence of certain cations that can contribute to the perception of hardness, even though they do not cause the formation of scale or interfere with the lathering of soap. These cations are typically sodium (Na+) and potassium (K+).
Explanation
Calcium and Magnesium
Calcium (Ca2+) and magnesium (Mg2+) are the primary contributors to the hardness of water. When water contains high concentrations of these cations, it is classified as hard water. Hard water can cause scaling in pipes, reduce the effectiveness of soaps and detergents, and leave behind residue on fixtures and surfaces.
Sodium
Sodium, on the other hand, does not contribute to the hardness of water. It is a monovalent cation (Na+) and does not form insoluble compounds with anions such as carbonate and sulfate, which are responsible for the formation of scale in hard water.
Pseudo Hardness
While sodium does not cause the typical problems associated with hard water, it can still impart a perception of hardness due to its high ionic strength. The presence of sodium ions in water can affect the taste and feel of the water, making it seem harder than it actually is.
Conclusion
In the given options, only option D (Sodium) is correct. While calcium and magnesium are the primary contributors to water hardness, sodium can impart pseudo hardness to water due to its high ionic strength. Therefore, option D is the correct answer.
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Which of the following cations impart(s) pseudo hardness to water?a)Calcium onlyb)Magnesium onlyc)Calcium and magnesiumd)SodiumCorrect answer is option 'D'. Can you explain this answer?
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