The compound para–aminobenzoic acid (PABA) is a powerful sun–screening agent whose salts were once used widely in sun tanning and screening lotions. The parent acid, which we may symbolize as H–Paba, is a weak acid with a pKa of 4.92 (at 25 °C). What are the [H+] and pH of a 0.030 M solution of this acid? Please help!!
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So write an equation for the dissociation of the acid, then use it to write an equilibrium expression.
i thought that you would find H+ by multiplying 4.92 and 0.030 and then for the ph you would solve for x?
it's not too far off. multiply the Ka by 0.03 then take the squared root, then you have [H+].
Next take the negative logarithm of [H^+] then you have the pH