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The pH of 0.05M aqueous solution of diet...

The `pH` of `0.05M` aqueous solution of diethy`1` amine is `12.0` . Caluclate `K_(b)`.

Text Solution

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`pOH = 14 - pH = 14 - 12 = 2`
`[OH^(-)] = 10^(-2)`
`{:((C_(2)H_(5))_(2)NH+H_(2)O,hArr,(C_(2)H_(5))_(2)NH_(2)^(+),+,OH^(-)),((0.05 - 0.01),," "0.01,,0.01):}`
`K_(b) = ([(C_(2)H_(5))_(2)NH_(2)^(+)][OH^(-)])/([(C_(2)H_(5))_(2)NH]) = (0.01xx0.01)/(0.04) = 2.5 xx 10^(-3)`
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Knowledge Check

  • The pH of 0.05 M Ba (OH)_(2) solution is

    A
    12
    B
    13
    C
    1
    D
    10

  • An aqueous solution whose pH= 0 is

    A
    acidic
    B
    neutral
    C
    basic
    D
    amphoteric

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