Solution.
Based on the data on the pH change depending on the added alkali, we see that the equivalence point is at a volume of 30 ml.
Write down the law of equivalents:
"C1 \\times V1 = C2 \\times V2"
"C(CH3COOH) = \\frac{C(NaOH) \\times V(NaOH)}{V(CH3COOH)}"
C(CH3COOH) = 0.3 mol/L
Answer:
C(CH3COOH) = 0.3 mol/L
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