Distinguishing between hard water and soft water Practice exercise 3

At home, Wanjiku uses rainwater for bathing and her sister uses tap water. Wanjiku's soap lathers more easily. Why is that?  (1 mark)

At home, Wanjiku uses rainwater for bathing and her sister uses tap water. Wanjiku's soap lathers more easily. Why is that?  (1 mark)

At home, Wanjiku uses rainwater for bathing and her sister uses tap water. Wanjiku's soap lathers more easily. Why is that?  (1 mark)

During handwashing at school, pupils notice that soap does not form lather when they use water from the tank. What can be the reason for this, and what should the teacher do?  (1mark)

During handwashing at school, pupils notice that soap does not form lather when they use water from the tank. What can be the reason for this, and what should the teacher do?  (1mark)

During handwashing at school, pupils notice that soap does not form lather when they use water from the tank. What can be the reason for this, and what should the teacher do?  (1mark)

A class wants to make liquid soap for a school project. Should they use tap water or rainwater? Explain your answer.  (1 mark)

A class wants to make liquid soap for a school project. Should they use tap water or rainwater? Explain your answer.  (1 mark)

A class wants to make liquid soap for a school project. Should they use tap water or rainwater? Explain your answer.  (1 mark)

A mother washes two glasses with water from different sources. One glass is clean, the other has white spots as shown below. What does this suggest about the water she used?  (1 mark)

A mother washes two glasses with water from different sources. One glass is clean, the other has white spots as shown below. What does this suggest about the water she used?  (1 mark)

A mother washes two glasses with water from different sources. One glass is clean, the other has white spots as shown below. What does this suggest about the water she used?  (1 mark)

Two pupils add soap to different bottles of water and shake them. One bottle forms foam, and the other does not as shown below. Which bottle has soft water and why?  (1 mark)

Two pupils add soap to different bottles of water and shake them. One bottle forms foam, and the other does not as shown below. Which bottle has soft water and why?  (1 mark)

An industrial cleaning company uses water from two towns. In Town A, cleaning soap lathers easily; in Town B, it doesn’t. What should they conclude, and what action should they take?  (2 marks)

An industrial cleaning company uses water from two towns. In Town A, cleaning soap lathers easily; in Town B, it doesn’t. What should they conclude, and what action should they take?  (2 marks)

An industrial cleaning company uses water from two towns. In Town A, cleaning soap lathers easily; in Town B, it doesn’t. What should they conclude, and what action should they take?  (2 marks)

A health officer is advising villagers on washing hands effectively. The only water source is a mineral-rich river. What should the officer recommend to ensure proper hygiene?  (1 mark)

A health officer is advising villagers on washing hands effectively. The only water source is a mineral-rich river. What should the officer recommend to ensure proper hygiene?  (1 mark)

A health officer is advising villagers on washing hands effectively. The only water source is a mineral-rich river. What should the officer recommend to ensure proper hygiene?  (1 mark)

A laundry owner in Nakuru notices white scum in basins and poor soap performance. The water is from a borehole. What type of water is likely being used and how can the owner solve the problem?  (2 marks)

A laundry owner in Nakuru notices white scum in basins and poor soap performance. The water is from a borehole. What type of water is likely being used and how can the owner solve the problem?  (2 marks)

A laundry owner in Nakuru notices white scum in basins and poor soap performance. The water is from a borehole. What type of water is likely being used and how can the owner solve the problem?  (2 marks)

After washing utensils, a family in Eldoret notices white stains on their glasses and kettles. What does this suggest about the water and what should they do?  (2 marks)

After washing utensils, a family in Eldoret notices white stains on their glasses and kettles. What does this suggest about the water and what should they do?  (2 marks)

After washing utensils, a family in Eldoret notices white stains on their glasses and kettles. What does this suggest about the water and what should they do?  (2 marks)

After washing utensils, a family in Eldoret notices white stains on their glasses and kettles. What does this suggest about the water and what should they do?  (2 marks)

A boarding school uses two water tanks. Water from Tank A forms foam easily, while water from Tank B forms scum and poor lather. The image below shows water samples after shaking with soap. Which tank has hard water and what should the school do?

A boarding school uses two water tanks. Water from Tank A forms foam easily, while water from Tank B forms scum and poor lather. The image below shows water samples after shaking with soap. Which tank has hard water and what should the school do?

A boarding school uses two water tanks. Water from Tank A forms foam easily, while water from Tank B forms scum and poor lather. The image below shows water samples after shaking with soap. Which tank has hard water and what should the school do? (2 marks)