A 4.08 M solution of a weak acid is found to have a pH of 1.06, then it's pKa is calculated as 2.72.
In chemistry, pH potential of hydrogen is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions have lower pH values than basic or alkaline solutions. Water has neutral pH of 7 which implies that it is neither acidic or basic. The scale ranges from 0 to 14.
− log [H+] = pH= 1.06
[H+] = 10^(-1.06)
=[H+]^2 / [HA]i - [H+]
= (10^-1.06* 10^-1.06) / (4.08 - 10^(-1.06))
Ka = 1.901 *10^-3 M
pKa = - log (Ka)
= - log (1.901 *10^-3)
pKa = 2.72
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