IGCSE/ A-Level Revision Questions

Solution	Colour of Indicator Paper	Approximate pH
Solution A	Yellow	2
Solution B	Green	7
Solution C	Violet	10

Solution

Colour of Indicator Paper

Approximate pH

Solution A

Yellow

Solution B

Green

Solution C

Violet

Solution A: Acidic - The yellow colour indicates a low pH (approximately 2). Yellow colours on the universal indicator paper correspond to acidic solutions, meaning they have a higher concentration of hydrogen ions (H⁺) than hydroxide ions (OH^-).

Solution B: Neutral - The green colour indicates a pH of approximately 7. Green colours on the universal indicator paper correspond to neutral solutions, meaning the concentrations of hydrogen ions and hydroxide ions are approximately equal.

Solution C: Alkaline - The violet colour indicates a high pH (approximately 10). Violet colours on the universal indicator paper correspond to alkaline (or basic) solutions, meaning they have a higher concentration of hydroxide ions (OH^-) than hydrogen ions (H⁺).

Chemistry – Acids, bases and salts - The characteristic properties of acids and bases | e-Consult

Acids, bases and salts - The characteristic properties of acids and bases (1 questions)