4.2.4 The pH Scale & Neutralisation

• What do acids produce in aqueous solutions?

  Hydrogen ions (H+).
• What do aqueous solutions of alkalis contain?

  Hydroxide ions (OH-).
• What is the pH scale?

  The pH scale is a measure of the acidity or alkalinity of a solution, ranging from 0 (most acidic) to 14 (most alkaline).
• Which two ways can pH be measured?

  Universal indicator or a pH probe.
• What would you call a solution with a pH of 7?

  Neutral.
• What would a solution with a pH of 0-6 be?

  An acid.
• What would a solution with a pH of 8-14 be?

  An alkali.
• Hydrogen ions react with hydroxide ions to produce what?

  Water.
• H+(aq) + OH-(aq) = H2O(l)