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Boric acid is a weak monobasic acid. It ...

Boric acid is a weak monobasic acid. It ionizes in water as
`B(OH)_(3)+H_(2)O Leftrightarrow B(OH)_(4)^(-)+H^(+), K_a=5.9 xx 10^(-10)`. Calculate pH of 0.3 M boric acid.

Text Solution

Verified by Experts

The correct Answer is:
4.87
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Knowledge Check

  • A : Boric acid is weak monobasic acid . R : Boric acid give one H^(+) ion .

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
    C
    If Assertion is true statement but Reason is false , then mark (3)
    D
    If both Assertion and Reason are false statements , then mark (4)

  • Boric acid Br(OH)_(3) is monobasic Lewis acid if gives H^(+) ions in aquoeus soluions as follows B(OH)_(3) + H_(2)O hArr [B(OH)_(4)]^(-) + H^(+) K_(a) = 5.9 xx 10^(-10) The P^(H) of 0.025M aqueous solution is [log 5.9 = 0.771]

    A
    `5.42`
    B
    `4.52`
    C
    `2.45`
    D
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  • Boric acid H_3BO_3 is

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    B
    Bronsted acid
    C
    Lewis acid
    D
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