Hard and Soft Water

The water that forms lather easily

• Hard water

• Soft water

Hardness in water is caused by the presence of:

• Sodium chloride

• Sodium carbonate

• Calcium chloride

• Potassium nitrate

The water that forms lather easily

• Hard water

• Soft water

• Salt water

• Distilled water

Hardness in water is caused by the presence of:

• Sodium chloride

• Sodium carbonate

• Calcium chloride

• Potassium nitrate

Which of the following ions is primarily responsible for the temporary hardness of water?

• Calcium ions

• Magnesium ions

• Bicarbonate ions

• Sulfate ions

What is the main chemical process used to remove permanent hardness from water?

• Boiling

• Filtration

• Ion exchange

• Distillation

Which of the following is a common method to soften hard water at home?

• Adding salt

• Boiling

• Using a water softener

• Freezing

What is the main disadvantage of using hard water in household appliances?

• Corrosion

• Scaling

• Rusting

• Staining

Which of the following compounds is used in water softeners to replace calcium and magnesium ions?

• Sodium chloride

• Potassium permanganate

• Sodium carbonate

• Sodium bicarbonate

What is the effect of hard water on soap?

• Enhances lather formation

• Reduces lather formation

• No effect

• Increases soap consumption