Common Misconceptions

⚠️ Common Misconceptions

Misconception 1: "Neutralisation always gives a solution at pH 7"

Neutralisation only gives exactly pH 7 when the acid and alkali are mixed in exactly the right proportions (the equivalence point). If even a slight excess of either acid or alkali remains, the pH will be slightly below or above 7. In a titration, it is only at the precise endpoint that the pH reaches exactly 7 (for strong acid/strong alkali). Using weak acids or alkalis can give a slightly different pH at equivalence.

Misconception 2: "The product is always water and table salt (NaCl)"

The word "salt" in chemistry means any ionic compound formed from neutralisation — it does not always mean sodium chloride. For example, HCl + NaOH → NaCl + H₂O produces sodium chloride, but H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O produces potassium sulfate. The salt name depends on the acid and base used.

Misconception 3: "Acid + carbonate is the same as acid + metal"

Acid + carbonate produces three products: salt + water + carbon dioxide. Acid + metal produces only two: salt + hydrogen. These are easily confused in equations. The distinctive observation for acid + carbonate is fizzing/effervescence, and you test for CO₂ by passing it through limewater (turns milky), not by the squeaky pop test (which is for hydrogen).