Question

Which would allow you to add more powdered mix to the water?

Dissolve the powdered mix first because it increases solubility of the powdered mix.

Dissolve the powdered mix first because it is easier to stir when the water is cold.

Heat up the water first because it increases solubility of the powdered mix.

Heat up the water first because it is easier to stir when the water is hot.
A cup of cocoa with some undissolved cocoa powder floating on top of the liquid.

Answer 1

Heat up the water first because it increases solubility of the powdered mix.

Warmer water dissolves and accepts more of most solid powders (and speeds up dissolution), so you can add more cocoa before it stops dissolving. Stirring helps too.