To test for hardness of water, we need to dissolve a compound in pure water that will make it hard. Let's analyze each of the given compounds to determine which one can be used:

(i) Hydrogen Carbonate of Sodium: This compound, also known as sodium bicarbonate (NaHCO3), does not contribute to water hardness. It is a common ingredient in baking soda and does not form insoluble precipitates with calcium or magnesium ions.

(ii) Sulphate of Magnesium: Magnesium sulfate (MgSO4) can be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with calcium ions.

(iii) Chloride of Calcium: Calcium chloride (CaCl2) can also be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with carbonate ions.

(iv) Carbonate of Sodium: Sodium carbonate (Na2CO3) is another compound that can be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with calcium ions.

Based on the analysis, compounds (ii) Sulphate of Magnesium, (iii) Chloride of Calcium, and (iv) Carbonate of Sodium can be dissolved in pure water to make it hard.

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To test for hardness of water, we need to dissolve a compound in pure water that will make it hard. Let's analyze each of the given compounds to determine which one can be used:

(i) Hydrogen Carbonate of Sodium: This compound, also known as sodium bicarbonate (NaHCO3), does not contribute to water hardness. It is a common ingredient in baking soda and does not form insoluble precipitates with calcium or magnesium ions.

(ii) Sulphate of Magnesium: Magnesium sulfate (MgSO4) can be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with calcium ions.

(iii) Chloride of Calcium: Calcium chloride (CaCl2) can also be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with carbonate ions.

(iv) Carbonate of Sodium: Sodium carbonate (Na2CO3) is another compound that can be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with calcium ions.

Based on the analysis, compounds (ii) Sulphate of Magnesium, (iii) Chloride of Calcium, and (iv) Carbonate of Sodium can be dissolved in pure water to make it hard.

Knowee AI · Accepted Answer

To test for hardness of water, we need to dissolve a compound in pure water that will make it hard. Let's analyze each of the given compounds to determine which one can be used:

(i) Hydrogen Carbonate of Sodium: This compound, also known as sodium bicarbonate (NaHCO3), does not contribute to water hardness. It is a common ingredient in baking soda and does not form insoluble precipitates with calcium or magnesium ions.

(ii) Sulphate of Magnesium: Magnesium sulfate (MgSO4) can be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with calcium ions.

(iii) Chloride of Calcium: Calcium chloride (CaCl2) can also be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with carbonate ions.

(iv) Carbonate of Sodium: Sodium carbonate (Na2CO3) is another compound that can be dissolved in water to make it hard. It is a common component of hard water and can form insoluble precipitates with calcium ions.

Based on the analysis, compounds (ii) Sulphate of Magnesium, (iii) Chloride of Calcium, and (iv) Carbonate of Sodium can be dissolved in pure water to make it hard.

You want to test for hardness of water but hard water is not available inthe laboratory. Which of the following compounds may be dissolved inpure water to make it hard ?(i) Hydrogen Carbonate of Sodium(ii) Sulphate of Magnesium(iii) Chloride of Calcium(iv) Carbonate of Sodium

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