What will you observe when : (a) a drop of sodium hydroxide is added to blue litmus ? (b) a drop of hydrochloric acid is added to China rose indicator? (c) a drop of dilute sulphuric acid is added to red-cabbage juice?
Answers
Answer:
a] when we add a drop of sodium hydroxide (NAOH) to blue litmus ,it's colour doesn't change and paper remains blue in colour
b] colour changes to dark pink or magneta
c]colour changes to pink\red
Explanation:
a] blue litmus is basic in nature due to this colour don't change
b]china rose indicator is light pink in colour and when acid added to it colour changes to magenta and base added to it colour changes to green.
c]Red cabbage contains a chemical called anthocyanin. This changes colour depending on the acidity. It turns a pink/red colour in the presence of an acid, is purple when neutral and when added to a basic substance turns blue or green.
Answer:
a) No colour change.
b) Colour changes to dark pink.
c) Colour changes to pink.
Explanation:
a) When blue litmus is dropped in basis medium then it shows no change but when it is dropped in acidic medium, it changes its colour to red. Sodium hydroxide is a base and thus it has no effect on a blue litmus paper but it changes red litmus to blue.
b) When a drop hydrochloric acid is added to china rose solution it turns Dark pink this shows it contains strong acid.
c) When a drop of dilute sulphuric acid is added to red cabbage juice is it turns pink this shows that it is acidic.
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