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Solubility #1
Some solids dissolve only slightly. Other solids are very
soluble - a lot can be dissolved in a small volume of solvent. The solubility
of solids also depends on the temperature of the solvent.
This sort of graph is called a solubility curve.
Draw a graph to show the solubility of potassium nitrate, the
figures are given below. The solubility goes up the side,
the temperature goes along the bottom. Draw a smooth curve through the points
on the graph:
Graph: SOLUBILITY
#2
Fill in the difference column and answer the questions that
follow.
If you heated 100 g of water to 80oC, how
much potassium nitrate could you dissolve in it?
If you now cooled the solution to 40oC, how
much potassium nitrate would crystallise out?
How much potassium nitrate do you think you could dissolve in 50
g of water at 20oC?
Read the following information and answer the questions in
complete sentences. Fortunately for fish, oxygen is slightly soluble in water. A
fish takes water in through its mouth. The water passes over the fish's
gills, which are able to remove the dissolved oxygen. The water, minus the
dissolved oxygen, then passes out through the gill slits.
Fizzy drinks contain a dissolved gas - carbon dioxide. It isn't
a very soluble gas, so it is forced into the water under pressure. When you
unscrew the top of a bottle of fizzy drink, the pressure is released and the
carbon dioxide comes back out of solution. You see bubbles of gas streaming
to the surface. Carbon dioxide is added to drinks to improve the taste. If
you leave the top off a bottle, most of the carbon dioxide will be released
and the drink will taste 'flat'.
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Which
is the least soluble at 15