Why the phenolphthalein turns pink in borax solution? Why it becomes colourless in presence of glycerol?

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.

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Explain the phenomenon : "When phenolphethaline is added to aqueous solution of Borax the colour of the solution changed to pink which is again turn colourless if glycerol is added to it

This question has Statement I and Statement II. Of the four choices given after the Statement, choose the one that best describes the two Statement. Statement - I : Borax solution gives a pink colour with phenolphthalein Statement - II : Borax solution may be titrated as an alkali with HCl using methyl orange indicator.

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