A standard HCl solution is titration to a pink phenolphtalein endpoint by adding NaOH solution while stirring. If a solution becomes pink throughout but loses its colour upon standing for a short time, what should be done to restore the coloure ?

Why did the colour of the phenolpthalein in NaOH solution change after adding the HCl solution ?

A dilute solution of p-resoniline hydrochloride in water whose pink colour has been discharged by passing sulphur dioxide , does not restore its colour by

When phenolphthalein is added to an aqueous solution of borax, the solution becomes pink in colour. However, when glycerol is added to the solution, it becomes colourless again. Explain.

Vijay tested a solution with phenolphthalein indicator it was changed into pink colour. What is the colour of methyl orange in that solution ?

On adding methyl orange to a solution A it imparts a pink colourand on adding it to solution 'B' a yelow colour is obtained. A and B solution are respectively.

Solution of a substance X changes its colour to pink when Phenolphthalein is added to it. Solution of another substance Y change its colour to yellow on adding methyl orange as shown in the figure below: Identify the correct nature of solutions of X and Y:

Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a color change will be observed? State the colour change and give its reason.