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CAIE IGCSE Chemistry 7.1.3 Bases are oxides or hydroxides of

CAIE IGCSE Chemistry 7.1.3 Bases are oxides or hydroxides of
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise defining bases and alkalis, then applying those definitions to metal oxides, hydroxides and alkaline aqueous solutions.

How this is tested

  • state that a base accepts H+ ions and an alkali is a base soluble in water
  • apply the alkali definition to oxides or hydroxides forming high-pH aqueous solutions

Question 3(b)

[Maximum number: 1]

This question is about acids, bases and alkalis.
Table 3.1 shows the pH values of some substances.

Table 3.1

Table 3.1

State what is meant by the term alkali.