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CAIE IGCSE Chemistry Comparing Acidity Alkalinity and pH

Practise using pH and universal-indicator colour to compare hydrogen-ion concentration, identify neutrality and rank relative acidity or alkalinity.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • use lower pH to identify greater hydrogen-ion concentration and stronger relative acidity
  • identify pH seven and green universal indicator as neutral under standard conditions
  • use higher pH and blue-to-purple colours to identify increasing relative alkalinity

7.1.7—To compare hydrogen ion concentration question 1

[Maximum number: 1]

Iron is a transition element. Potassium is a Group I element.

Chemical properties of some Group I elements are shown in the table.

Table for Question 7.1.7—To compare hydrogen ion concentration question 1 — CAIE IGCSE Chemistry

Predict the pH of the colourless solution formed when potassium reacts with water.

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