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प्रश्न
Give a reason for the following.
Hard water is not good for washing utensils.
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उत्तर
Reason:
Hard water damages the utensils and containers in which it is stored and forms a hard layer.
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संबंधित प्रश्न
What do you understand by
Temporary hard water
Name the substance which makes water permanently hard.
Both temporary & permanent hardness in water can be removed by addition of washing soda. Give balanced equations for the same.
State what are synthetic detergents. Explain experimentally how you will determine the advantage of synthetic detergents over soap using a sample of hard water.
Select the correct answer from the choice given in the options.
A substance which causes hardness in water _____.
Name or state the following:
A substance added to remove both temporary and permanent hardness in water.
What are the causes of temporary hardness and permanent hardness of water?
Why does hard water not form lather with soap?
What is soft water?
Take samples of water from different sources (like a tube well, a lake, a pond, or a river) and pour equal quantities of each sample of water into different test tubes. Measure the height of water in each test tube with a scale. Add one or two drops of liquid soap to each test tube. Shake each test tube five times and observe the height of the lather in each sample. Record your observations in the table. Which water is soft? Which water is hard? Can you say why?
