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Calculate the pH at which an acid indica...

Calculate the pH at which an acid indicator with `K_(a), = 1.0 xx 10^(-5)` changes colour when the indicator concentration is `1.0 xx 10^(-3)` M

Text Solution

Verified by Experts

The correct Answer is:
5
` pH =P^(KIn) = - log KIn =-log 10 ^(_5) = 5`
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Knowledge Check

  • An acid -base indicator has a Ka of 3.0 xx 10^(-5) The acid form of the indicator is red and the basic form is blue. Then

    A
    pH is 4.05 when indicator is 75 % red
    B
    pH is 5.00 when indicator is 75% blue
    C
    pH is 5.00 when indicator is 75 % red
    D
    pH is 4.05 when indicator is 75% blue

  • The pH of 0.05 M acetic acid is (K_(a) = 2 xx 10^(-5))

    A
    2
    B
    11
    C
    `10^(-3)`
    D
    3

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