Thames & Kosmos Global Water Quality handleiding

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Handleiding

EXPERIMENT 8 Sparkling water sparkles

Lift up on the balloon so that

all the baking soda falls into the

bottle. It will react with the vinegar

and produce a lot of carbon dioxide

gas, which will inflate the balloon.

Shake the bottle a little to help the

reaction along.

Carefully remove the balloon, being sure

not to let the gas escape. With the help of the

straw, force the gas into the second bottle so

that it collects on top of the water. Remove

the balloon and quickly twist the cap onto the

bottle. Shake the bottle vigorously for a few

seconds. What happens?

You can pour the liquid down the drain.

Rinse the sink with water afterwards.

Explanation:

There is a lot of carbon dioxide chemically bonded in the baking soda

powder. An acid, in this case vinegar, releases it.

When the carbon dioxide is transferred into the bottle with the

water, it pushes out the air from inside the bottle. After you shake it,

a portion of the carbon dioxide has disappeared. It has dissolved in

the water to form carbonic acid. That means that there is some gas

missing in the bottle, which collapses in on itself.

Unfortunately, this gas, which we humans produce in large quantities

every day, also dissolves in the world’s oceans, where it turns into

carbonic acid and harms ocean creatures such as coral and shellfish.

Water

Vinegar

More Tests!

Now test the pH value of the water!

Global Water Quality Manual 2013.indd 17 2/7/13 10:22 AM

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