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Questions and Answers
How can impurities with suspended particles between $10^{-5}$ to $10^{-7}$ in size be removed?
Which type of impurity causes alkalinity and hardness in water?
What is the method to remove impurities that cannot settle down with gravitational force effect?
What percentage of water is available in oceans and not directly useful for daily use?
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Which of the following is NOT a common impurity found in natural water?
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What are some common purposes of water in industries?
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What do suspended impurities in natural water cause?
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Study Notes
Removal of Impurities
- Impurities with suspended particles between $10^{-5}$ to $10^{-7}$ in size can be removed through filtration or centrifugation.
Types of Impurities
- Alkalinity and hardness in water are caused by impurities of calcium and magnesium bicarbonates.
Removal of Non-Settling Impurities
- Impurities that cannot settle down with gravitational force effect can be removed through coagulation and flocculation.
Availability of Water
- About 97% of water is available in oceans, but it is not directly useful for daily use.
Common Impurities
- The following are common impurities found in natural water: calcium, magnesium, and bicarbonates.
Uncommon Impurities
- Radioactive substances are NOT a common impurity found in natural water.
Industrial Use of Water
- Water is commonly used in industries for purposes such as processing, cooling, and washing.
Effects of Suspended Impurities
- Suspended impurities in natural water cause turbidity, which can affect the aesthetic and hygienic quality of water.
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Description
Test your knowledge about the significance of water in our daily lives, its availability on Earth's surface, and its different uses for domestic, industrial, and agricultural purposes.
