Acids, alkalis and the pH scale
Acids, alkalis and the pH scale

An aqueous solution is one where a substance is dissolved in water. Acids and alkalis are defined in water because acids produce H+H^+H+ ions in aqueous solution, while alkalis produce OH−OH^-OH− ions.
Step-by-step lessons covering Edexcel IGCSE Chemistry Acids, alkalis and titrations for IGCSE Chemistry. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.