THREE GLASSES OF LEMONADE
T
he chemist started to make lemonade. He was doing it in such an unusual way that we couldn’t take our eyes off him. It turned out to be very useful, because without that special lemonade-making, we wouldn’t be able to make a single experiment in a chemistry lab.
I’ll show you how to make lemonade.
What you need:
• • a small bottle of water, a tall glass, three lemons, one pink grapefruit, a measuring cup with markers, sugar, a kitchen scale, a lemon-squeezer, straws, a funnel, a paper coffee filter.
INSTRUCTIONS
1. Pour 5 g of sugar into each glass (see the
5. Pour 20 ml of filtered juice into each glass
2. Add slowly 150 ml of water to each glass
6. Squeeze the juice from the grapefruit. 7. Add 5 ml of grapefruit juice to each glass
experiment No. 4).
(see the experiment No. 5).
3. Squeeze the juice from the lemons. 4. Filter the juice in order to remove the
flesh and the seeds (see the experiment No. 6)
14
(see the experiment No. 7).
(see experiments 8 and 9).
8. Put the straws and teaspoons in the glasses so that everyone can stir the lemonade. Serve.