Thames & Kosmos Ooze Labs: Chemistry Station handleiding

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Handleiding

Acid detective

When baking soda (sodium hydrogen

carbonate) reacts with acids, carbon dioxide

forms (the same gas that you know from the

previous experiment). You can see this

reaction in the bubbles that appear in the

liquid.

You can now examine various liquids and test

to see if they produce a bubbling acidic

reaction when baking soda is added to them.

YOU WILL NEED

3 test tubes and 2 test tube racks, measuring

spoon, baking soda, test liquids (e.g., cola,

iced tea, cooking oil, milk, lemonade, apple

juice, fizzy drinks, or other liquids from your

refrigerator)

HERE’S HOW

1. Fill a test tube with one of your test liquids

to a height of two centimeters in the tube.

2. With some liquids, you will observe that

they are already bubbling or fizzing. To

make sure you don’t confuse this bubbling

with a reaction to the baking soda, stir

these fluids with the measuring spoon until

no more bubbles can be seen. Then add a

small spoonful of baking soda to the liquid

and observe whether it bubbles or not.

Test liquid Cola Iced tea Lemonade Fizzy drink Milk

Cooking

oil

Is it an acid?

WHAT’S HAPPENING

In acidic liquids, baking soda causes bubbles

to form. In non-acidic liquids, it does not cause

bubbles to form. From this you can identify

which liquids are acidic and which are not. The

process of using tools and methods to

separate, identify, and quantify materials is

called chemical analysis.

› › › EXPERIMENT 13

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