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

Past paper questions on spec point:

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