A bit of revision:
GCSE Bitesize – Acids, Bases & Salts (5m 23s):
Bitesize Top 20 Science Demos – Acids & Alkalis (3m 12s). Also (in American) is a 14m 13s video on Acids & Bases.
Coke Cans in Acid and Base from the Periodic Table of Videos. All about that Base (no acid) – musical parody.
Complete Chemistry for Cambridge IGCSE, chapter 11, pp.148 – 153
Infographic from Compound Interest: