Fizzy Tablets

Some completed tablets.
Tablets of sodium bicarbonate.

I wanted to make some tablets with baking soda in them, since the sodium bicarbonate in them would fizz in vinegar. The chemical reaction is:

Sodium bicarbonate plus vinegar produces sodium acetate, water, and carbon dioxide gas


The main challenge was how to hold a powder mixture together. We tried agar agar powder, and corn flour, but the tablets were fairly crumbly. Then we tried gelatine powder, and that worked quite well.

We used baking soda and gelatine powder in equal quantities, with a little food colouring. The gelatine was to help hold the tablet together and to slightly slow the reaction. The food colouring was for interest and to help stick it together.

The ingredients
The ingredients

A garlic press worked well for compacting the mixture. We inserted a piece of plastic inside, across the holes, to press the mixture against.

Pressing the tablets.
Pressing the tablets.

When we wanted to get the tablets out we used a pin to push the disk (and tablet) out.

A pin was used to push out the plastic and hence the tablet.
A pin was used to push out the plastic, and hence the tablet.
Tablets of baking soda, gelatine and food colouring.
Tablets of baking soda, gelatine and food colouring, ready to go.
A good fizzy effect.
A good fizzy effect.

And this is what happens when you put one in vinegar:


Next project is to see if we can make tablets with citric acid in them, so we can add one tablet of each to water, instead of needing vinegar.

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