Get premium membership and access questions with answers, video lessons as well as revision papers.
Apparatus:
• Some water from a hard water source e.g. bore hole or a well.
• Source of heat
• A container e.g. aluminum sufuria
• A bar of soap
• Two basins
Procedure/ method:
• The water is divided into two equal amounts and some put in the aluminum sufuria and the other into the basin.
• The water in the aluminium sufuria is boiled, then poured into the other basin and allow it to cool.
• Use soap to lather with cool boiled water and the unboiled water.
Observations:
It may have been observed that the inside of the sufuria used to boil the water is stained. This is scale.
Conclusion:
When water is boiled, the mineral salts present in the water are broken and are deposited in the container used for boiling as scale and this way the water becomes soft. This is why it was found that it was easier to form lather with cool boiled water. This shows that boiling is a simple method of softening hard water.
raphael answered the question on October 9, 2018 at 04:47
- State three methods of softening hard water(Solved)
State three methods of softening hard water
Date posted: October 9, 2018. Answers (1)
- What are the disadvantages of hard water?(Solved)
What are the disadvantages of hard water?
Date posted: October 9, 2018. Answers (1)
- Outline the signs and effects of ill health in livestock(Solved)
Outline the signs and effects of ill health in livestock.
Date posted: October 9, 2018. Answers (1)
- Explain the adaptations of birds on feeding with aid of diagrams(Solved)
Explain the adaptations of birds on feeding with aid of diagrams.
Date posted: October 9, 2018. Answers (1)
- Types of crop pests, effects and control measures(Solved)
Types of crop pests, effects and control measures
Date posted: October 9, 2018. Answers (1)
- Explain the meaning of a food chain, giving examples(Solved)
Explain the meaning of a food chain, giving examples.
Date posted: October 9, 2018. Answers (1)
- Show the areas of interdependence between Animals to plants and plants to plants(Solved)
Show the areas of interdependence between Animals to plants and plants to plants.
Date posted: October 9, 2018. Answers (1)
- Describe an experiment on conditions necessary for germination(Solved)
Describe an experiment on conditions necessary for germination.
Date posted: October 8, 2018. Answers (1)
- List the parts of a seed and give their functions. Give a diagram showing the parts.(Solved)
List the parts of a seed and give their functions. Give a diagram showing the parts.
Date posted: October 8, 2018. Answers (1)
- Outline the functions of parts of flower with aid of diagrams(Solved)
Outline the functions of parts of flower with aid of diagrams.
Date posted: October 8, 2018. Answers (1)
- Explain the effects of air pollution on animals, plants and non-living things(Solved)
Explain the effects of air pollution on animals, plants and non-living things.
Date posted: October 8, 2018. Answers (1)
- Explain the major causes of air pollution(Solved)
Explain the major causes of air pollution.
Date posted: October 8, 2018. Answers (1)
- Outline the various methods of soil conservation(Solved)
Outline the various methods of soil conservation.
Date posted: October 8, 2018. Answers (1)
- Explain the effects of soil pollution on plants and animals(Solved)
Explain the effects of soil pollution on plants and animals.
Date posted: October 8, 2018. Answers (1)
- Outline some of the causes of soil pollution(Solved)
Outline some of the causes of soil pollution.
Date posted: October 8, 2018. Answers (1)
- Explain the major components of the environment(Solved)
Explain the major components of the environment.
Date posted: October 8, 2018. Answers (1)
- Outline the effects of drugs on health and society(Solved)
Outline the effects of drugs on health and society
Date posted: October 8, 2018. Answers (1)
- Give ways through which medicines are misused(Solved)
Give ways through which medicines are misused.
Date posted: October 7, 2018. Answers (1)
- Give examples of sexually transmitted infections giving causes and prevention measures(Solved)
Give examples of sexually transmitted infections giving causes and prevention measures.
Date posted: October 7, 2018. Answers (1)
- What are some of the control measures for HIV/AIDS?(Solved)
What are some of the control measures for HIV/AIDS?
Date posted: October 7, 2018. Answers (1)