A Crude Type of Disappearing Ink Is Based on the Following

question 158

Multiple Choice

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?

• A)add water
• B)decrease the volume
• C)put the paper in a freezer
• D)put the paper in an oven

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