關於計pH log嗰度

數學上，《log10》(以 10 為底的 log) 可用《log》表示。

因此，按計算機時，計算 log10 (0.100) 時，只需按 《log》然後按《0.100》便可。
計算機給出的答案是 -1。
pH = - log10 (0.100) = - (-1) = 1

若不用計數機計算：
pH = -log10 (0.100) = -log10 (10)⁻¹ = - (-1) log10 (10) = 1

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Calculate the pH of a sample of milk whose concentration of H⁺ ions is 2.51 x 10⁻⁷mol dm⁻³.

The pH of the milk
= -log (2.51 x 10⁻⁷)
= 6.6


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If concentration of H⁺ ions increases, the pH decreases.
If concentration of H⁺ ions decreases, the pH increases.
If pH increases, the concentration of H⁺ ions decreases.
If pH decreases, the concentration of H⁺ ions increases.