s 發問時間: 科學及數學化學 · 4 星期前

在standardization of sodium thiosulphate experiment,為什麼加入硫酸後要立刻滴定?

1 個解答

  • 4 星期前

    In acidic solution, thiosulphate ions undergo decomposition according to the following equation:

    2H⁺(aq) + S₂O₃²⁻(aq) → S(s) + SO₂(aq/g) + H₂O(l)

    However, the rate of the above decomposition is slow. In order to minimize the effect of the decomposition on experiment result, the titration must be done immediately after the addition of sulphuric acid.