Triphenylmethanol is insoluble in water, but when it is treated with concentrated H2SO4, a bright yellow solution results. As this yellow solution is diluted with water, its color disappears, and a precipitate of triphenylmethanol reappears. Suggest a structure for the bright yellow species.

The product is triphenylmethane dye

Explanation:

The H2SO4 removes the OH

Leaving triphenylmethane dye

Find attached the suggested structure

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).