# Problem:  K a for acetic acid is 1.8 x 10-5. What is the first digit of the pK a value for acetic acid?

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###### FREE Expert Solution

$\overline{){{\mathbf{pK}}}_{{\mathbf{a}}}{\mathbf{=}}{\mathbf{-}}{\mathbf{log}}\mathbf{\left(}{\mathbf{K}}_{\mathbf{a}}\mathbf{\right)}}$

###### Problem Details

K a for acetic acid is 1.8 x 10-5. What is the first digit of the pK a value for acetic acid?