Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How is the reaction between hydrogen ions and hydroxide ions to produce water presented as an equation?
   • This reaction can be represented by the equation: H (aq) OH-(aq) -> H2O(l)
2. How is water produced in a neutralisation reaction between an acid and an alkali in terms of ions?
   • In neutralisation reactions between an acid and an alkali, hydrogen ions react with hydroxide ions to produce water.
3. What piece of digital equipment can be used to measure the pH of a solution?
   • A digital pH probe can be used to measure the acidity or alkalinity of a solution more accurately and precisely than universal indicator.
4. What pH values do each of acidic, alkaline and neutral solutions have?
   • A solution with pH 7 is neutral. Aqueous solutions of acids have pH values of less than 7 and aqueous solutions of alkalis have pH values greater than 7.