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KINDS OF THINGS DISSOLVE?
four glass jars here, with stickers telling what they will have in them.
We will put one-half cup of cold water into each one. Now, let's add one
teaspoonful of salt
We can take turns being stirrers, as they all need stirring. We will stir until the crystals (solid stuff) have dissolved. They will take a lot of stirring, because we are using cold water. (Most things dissolve faster in hot water than in cold water.)
Those who are not stirring can make notes about what they see. It's a good idea to keep track of the time, as well. When we cannot see the solids, that means that they have dissolved. Which one dissolved first?
the soil? Soil is not soluble, and it will not ever dissolve. However,
it will go into suspension, which means that the tiny particles of soil
will float around in
After awhile, we might notice that the salt will not dissolve any more. That means that the water is saturated with salt; it cannot hold any more. Does that mean there is something wrong with the water we put into the salt jar? Nope. It means that salt is not as soluble as the other crystals we have used.
We might try to dissolve salt in boiling water, and see if the hot water will take more salt than the cold water.
Let's keep adding crystals to the other jars, until they reach the saturation point. Remember, we have to make notes of all this.
Next time you make Jello (gelatin dessert), you will understand how it works!
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