Spec 1CH0
Revise Edexcel GCSE Chemistry 4.1.2 Hydrogen ion concentration and pH with the question bank, lessons, revision guides, and flashcards.
3.4 Higher tier only. Explain that the higher the concentration of hydrogen ions in an acidic solution the lower the pH, and the higher the concentration of hydroxide ions in an alkaline solution the higher the pH. 3.5 Higher tier only. Recall that a change of one unit on the pH scale corresponds to a tenfold change in the concentration of hydrogen ions. This whole article is Higher tier only and is not assessed at Foundation tier.
