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Explain in why on addition of 1 moe of N...

Explain in why on addition of 1 moe of NaCl to 1L of water, the boiling point of water increases, while addition of 1 mole of methyl alcohol to 1 L of water decreases its boilbing point .

Text Solution

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NaCl is non-volatile solute. So, its addition to water lowers the vapour pressure of the water. Hence, boilling poitn of water ( solution) increases. W hares methyl alcohol is more valatile than water.
So, its addition to water increases the total vapour pressure over the solution. It re sults in the decre ase of boiling point.
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Explain why on addition of 1 mol of NaCl to 1 litre of water, the boiling of water increases, while addition of 1 mol of methyl alcohol to one litre of water decreases its boiling point.

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Knowledge Check

  • The boiling point of water at 1 atmospheric pressure is

    A
    `100^(@)`C
    B
    `0^(@)`C
    C
    `100.5^(@)` C
    D
    `-5^(@)` C

  • Number of molecules in 1 L of water is close to

    A
    `18/(22.4 )xx10^(23)`
    B
    `55.5 xx 6 . 023 xx10^(23)`
    C
    `(6.023)/23.4 xx 10^(23)`
    D
    `18xx 6. 023 xx 10^(23)`

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