2:28a describe the use of litmus to distinguish between acidic and alkaline solutions

Indicator Colour in acidic solution Colour in alkaline solution

Litmus Red Blue

Indicator	Colour in acidic solution	Colour in alkaline solution
Litmus	Red	Blue

Spec	Q'stion	Ans	MS
2:28	Jan '12 (2), Q 5 b	Answer	MkS
2:28	Jan '14 (1), Q 8 c iii	Answer	MkS
2:28	Jan '15 (1), Q 11 a ii	Answer	MkS
2:28	Jan '16 (2), Q 5 b iii	Answer	MkS
2:28	Jan '17 (1), Q 5 b iv	Answer	MkS
2:28	Jan '17 (1), Q 5 b v	Answer	MkS
2:28	Jan '17 (1), Q 7 b	Answer	MkS
2:28	Jan '17 (2), Q 4 a	Answer	MkS
2:28	Jan '18 (1), Q 7 c ii	Answer	MkS
2:28	Jan '18 (2), Q 1 b	Answer	MkS
2:28	Jan '18 (2), Q 1 c	Answer	MkS
2:28	May '10 (2), Q 6 a iii	Answer	MkS
2:28	May '14 (1), Q 15 b ii	Answer	MkS
2:28	May '15 (1), Q 3 c i	Answer	MkS
2:28	May '15 (1), Q 3 c ii	Answer	MkS
2:28	May '15 (1), Q 8 b	Answer	MkS
2:28	May '15 (1), Q 8 c	Answer	MkS
2:28	May '15 (1R), Q 4 b iii	Answer	MkS
2:28	May '15 (2R), Q 4 a iii	Answer	MkS
2:28	May '16 (2), Q 6 c	Answer	MkS
2:28	May '16 (2R), Q 5 c i	Answer	MkS
2:28	May '17 (1R), Q 14 b ii	Answer	MkS