Thames & Kosmos Gummy Candy Lab handleiding

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Thames & Kosmos

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Handleiding

5. Sour and bitter

You will need:

Sour mixture, water, red cabbage

indicator, small bowl, baking powder

Here’s how:

Take a pinch (about 2–3 grams) of

the sour mixture and mix it in 2

ml of water. Add the red cabbage

indicator to the solution. What do

you observe?

Pour half a cup of water into a

bowl and mix in 1 tablespoon

of baking soda. Add red cabbage

indicator to the solution. What do

you observe?

With adult supervision as always,

test these other substances from your

home with the red cabbage indicator.

What do you observe?

GEEK

OUT!

WHAT’S

HAPPENING?

When red cabbage indicator is

added to the sour mixture and

water solution, it changes to a red

color. The reason the red cabbage

solution turns red is because there

is acid in the sour mixture. The

acid in the sour mixture is citric

acid, which occurs naturally in

citrus fruits like lemons and limes.

That is why the sour mixture tastes

sour!

When the red cabbage

indicator is added to the water

and baking soda solution, it turns

green. That is because baking soda

is a base. Bases are slippery to the

touch and have a bitter taste. Don’t

eat the baking soda and water

solution — it will not taste good!

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