A crude type of disappearing ink is based on the following endothermic equilibrium: [Co(H₂O) ₆]Cl₂ (aq) ⇌ [CoCl₂(H₂O) ₄] (aq) + 2 H₂O (l)
(colorless) (blue)
If the reactant solution is used to write on a piece of paper and the paper is allowed to partially dry,what can be done to bring out the colored handwriting?

Question

Quizplus · Accepted Answer

Heating the paper in an oven will shift the endothermic equilibrium to the right, favoring the formation of the blue [CoCl2(H2O)4] complex, thus bringing out the colored handwriting.

A Crude Type of Disappearing Ink Is Based on the Following