Does the Solubility of Solid Salt Increase With the Volume of Water?

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The solubility of solid salt does not increase with the volume of water for a number of interesting reasons. Find out if the solubility of solid salt increases with the volume of water with help from an experienced chemistry and science professional in this free video clip.

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Video Transcript

Hi, I'm Robin Higgins, and this is, does the solubility of solid salt increase with the volume of water? In a word, no. Increasing the total volume of what you have does not increase the solubility of your solute. So let's look at an example. So, let's take simple table salt, or sodium chloride. Now, when you have water that's 20 degrees Celsius, your solubility is 35.89 grams of salt will go into 100 grams, or remember, that's the same as a hundred milliliters of H2O. So, If we have a cup with a hundred grams of water in it, we can take 30, almost 36 grams of salt and put it in there and it will completely dissolve after stirring. If we add anything after that, it will just remain as salt, it won't go into solution. So, let's imagine that we double that volume. So we go from 100 to 200 grams. Now, we guess we can fit more salt in here. So, it will be closer to around 70 grams that we can get in, but then here its solubility hasn't changed. We've just doubled the amount of solution that we have, not really increasing solubility at all. So how do we increase solubility? Well the easiest way is to increase temperature. So, if this is a solubility at 20 degrees Celsius, at 100 degrees Celsius, the boiling point of water, so this is boiling water now, the solubility of salt is actually 38.99 grams. So, we can fit about three more grams into our 100 grams of water if we raise the temperature by 80 degrees. And that's really the most effective way of increasing solubility. I'm Robin Higgins, and this has been, does the solubility of salt increase with the volume of water.


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