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Would you be able to check if water is h...

Would you be able to check if water is hard by using a detergent?

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Detergent gives lather with hard and soft water both, while a soap gives lather with soft water only. Thus, it not possible to check if water is hard by using a detergent.
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Soaps are the detergents used since long. Soaps used for cleansing purpose are sodium or potassium salts of long chain fatty acids such as stearic acid, palmitic acid. These cannot be used with hard water. Synthetic detergents are cleansing agents which have all the properties of soap but which actually do not contain any soap. These can be used both in soft water and hard water as they give foam even in hard water. Which is not true for a detergent molecule ?

Soaps are the detergents used since long. Soaps used for cleansing purpose are sodium or potassium salts of long chain fatty acids such as stearic acid, palmitic acid. These cannot be used with hard water. Synthetic detergents are cleansing agents which have all the properties of soap but which actually do not contain any soap. These can be used both in soft water and hard water as they give foam even in hard water. Which of the following is called invert soap?

NCERT-CARBON AND ITS COMPOUNDS -Exercise
  1. A mixture of oxygen and ethyne is burnt for welding. Can you tell why ...

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  2. How would you distinguish experimentally between an alcohol and a carb...

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  3. What are oxidising agents?

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  4. Would you be able to check if water is hard by using a detergent?

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  5. People use a variety of methods to wash clothes. Usually after adding ...

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  6. Ethane, with the molecular formula C(2)H(6) has

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  7. Butanone is a four-carbon compound with the functional group

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  8. While cooking, if the bottom of the vessel is getting blackened on the...

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  9. Explain the nature of the covalent bond using the bond formation in CH...

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  10. Draw the electron dot structures for (i) ethanoic acid (ii) H(2)S (i...

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  11. What is a homologous series ? Explain with an example.

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  12. How can ethanol and ethanoic acid be differentiated on the basis of th...

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  13. Why does micelle formation take place when soap is added to water? Wil...

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  14. Why are carbon and its compounds used as fuels for most applications?

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  15. Explain the formation of scum when hard water is treated with soap.

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  16. What change will you observe if you test soap with litmus paper (red a...

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  17. What is hydrogenation? What is its industrial application?

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  18. Which of the following hydrocarbons undergo addition reactions: C(2)H...

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  19. Give a test that can be used to differentiate chemically between butte...

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  20. Explain the mechanism of the cleansing action of soaps.

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