Thames & Kosmos Ooze Labs: Chemistry Station handleiding

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Thames & Kosmos

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Handleiding

Salty and sweet

solutions

YOU WILL NEED

2 small test tubes, chemistry station, pipette,

measuring spoon, water, magnifying lens, sugar,

table salt

HERE’S HOW

At first glance, sugar and salt look pretty

similar. Examine them carefully under a

magnifying lens and try to detect a difference.

Set two clean test tubes in the test tube rack

on your lab station. Place a measuring spoon

of sugar in one of the test tubes. Then, use the

pipette to add some water. Count the exact

number of drops added. Observe what

happens to the sugar. Swirl the test tube from

time to time as you add the water. How many

drops do you have to add before you can no

longer see the sugar?

3. Perform the same experiment with the salt.

What difference do you notice? When salt and

sugar have become invisible, does that mean

that they have disappeared? Also investigate

whether you can dissolve more or less sugar

in warm water.

WARNING!

Never leave the magnifying lens in the

sun. Fire danger! Never look directly

into the sun, either with your naked eye

or through the lens. You could blind

yourself!

NOTE!

If you dissolve so

much salt (or sugar)

in water that some

remains undissolved

at the bottom of the

container, meaning

that the solution

cannot absorb

anymore, you might

say that it is “full.”

When a solution

cannot dissolve any

more of a substance,

it is called a

“saturated solution”

by chemists.

WHAT’S HAPPENING

The solubility of various substances in water depends on their

composition. Salt and sugar, for example, are built out of different

building blocks, so they also behave differently when you dissolve

them. Neither of them will actually disappear, though. As a rule,

most substances, such as household sugar, will dissolve more

quickly and in greater quantities in hot water than in cold water.

Table salt, however, is an exception. Its solubility hardly depends

at all on the temperature.

› › › EXPERIMENT 17

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