To determine the pH of a weak acid, such as acetic acid, we need to use the formula for calculating the pH of a weak acid:
pH = -log(Ka) + log([acid])
Where:
Ka = acid dissociation constant = 1.8×10^-5
[acid] = concentration of the weak acid = 0.30 M
1. Calculate the pH using the formula:
pH = -log(1.8×10^-5) + log(0.30)
pH = -(-4.74) + (-0.5229)
pH = 4.74 - 0.5229
pH = 4.2171
Therefore, the pH of a 0.30 M acetic acid solution is approximately 4.22.
Determined the PH of 0.30 M acetic acid with the ka of 1.8×10 ^-5
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