How many grams of KI can be dissolved in 300gH2O at 10C?

Explanation:

Look at the graph attached. It contains the solubility curves for severals solutes.

I have marked the solubility of KI at 10ºC: look the intersection of the vertical and horizontal dotted red lines: the corresponding solubility is read on the vertical axis. It is slightlly above the midpoint between 130 y 140 g per 100 g of water. Thus, you can approximate to 136 g / 100 g of water.

You need the number of grams dissolved in 300 g of water, thus mutilply by 300:

Thus, about 408g of KI can be dissolved in 300 g of water at 10ºC.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.