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Which of the following cations impart(s) pseudohardness 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) pseudohardness to water ?a)Ca...
Monovalent cations impart pseudo-outer hardness. Hardness is the concentration of multivalent cations.
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Which of the following cations impart(s) pseudohardness to water ?a)Ca...
Explanation:
Pseudohardness:
Pseudohardness refers to the temporary hardness of water caused by the presence of certain cations, primarily calcium (Ca2+) and magnesium (Mg2+). These cations react with soap to form insoluble precipitates, resulting in reduced lathering and cleaning ability of the soap.
Effects of Calcium and Magnesium:
Calcium and magnesium are two common cations found in water sources. When water contains high concentrations of these cations, it is referred to as hard water. Calcium and magnesium ions react with soap molecules to form calcium and magnesium salts of fatty acids, which are insoluble and precipitate out of solution. This reduces the effectiveness of soap for cleaning and lathering.
Sodium:
Sodium, unlike calcium and magnesium, does not contribute to the hardness of water. Sodium salts, such as sodium chloride (NaCl), do not form insoluble precipitates with soap. Therefore, water containing sodium ions does not exhibit pseudohardness.
Answer:
Based on the given options, the correct answer is option 'D' - Sodium. Sodium does not contribute to the pseudohardness of water.
To summarize:
- Calcium and magnesium cations impart pseudohardness to water.
- Sodium does not contribute to pseudohardness.
- Pseudohardness is the temporary hardness caused by the presence of calcium and magnesium ions, which react with soap to form insoluble precipitates.
Pseudohardness:
Pseudohardness refers to the temporary hardness of water caused by the presence of certain cations, primarily calcium (Ca2+) and magnesium (Mg2+). These cations react with soap to form insoluble precipitates, resulting in reduced lathering and cleaning ability of the soap.
Effects of Calcium and Magnesium:
Calcium and magnesium are two common cations found in water sources. When water contains high concentrations of these cations, it is referred to as hard water. Calcium and magnesium ions react with soap molecules to form calcium and magnesium salts of fatty acids, which are insoluble and precipitate out of solution. This reduces the effectiveness of soap for cleaning and lathering.
Sodium:
Sodium, unlike calcium and magnesium, does not contribute to the hardness of water. Sodium salts, such as sodium chloride (NaCl), do not form insoluble precipitates with soap. Therefore, water containing sodium ions does not exhibit pseudohardness.
Answer:
Based on the given options, the correct answer is option 'D' - Sodium. Sodium does not contribute to the pseudohardness of water.
To summarize:
- Calcium and magnesium cations impart pseudohardness to water.
- Sodium does not contribute to pseudohardness.
- Pseudohardness is the temporary hardness caused by the presence of calcium and magnesium ions, which react with soap to form insoluble precipitates.
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Which of the following cations impart(s) pseudohardness to water ?a)Calcium onlyb)Magnesium onlyc)Calcium and magnesiumd)SodiumCorrect answer is option 'D'. Can you explain this answer?
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