Important Questions on Acids, Bases and Salts Name three common indicators. Name an indicator which is red in acid solution but turns blue in basic solution. Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.(Phenolphthalein/Methyl orange) Name the acid-base indicator extracted from lichens. (Vanilla / Litmus) Complete the following table:
Indicators
Neutral colour
Acidic medium
Basic solution
Methyl orange
Phenolphthalein
litmus
What are synthetic indicators? How will you test the given samples for acid or base with the help of this indicator? What is meant by olfactory indicators? Give any two examples. A solution was added to vanilla extract, then the characteristic smell of vanilla was not detected. State whether the given solution is acid or a base. 
