Thames & Kosmos Chemistry C500 (Version 2.0) handleiding
Handleiding
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To foam or
not to foam?
YOU WILL NEED
→ 2 test tubes
→ stopper
→ knife
→ bar of soap
→ 2 cups of tap water
→ cup of rainwater
→ cup of distilled water
HERE’S HOW
1. Use a knife to scrape a few shavings off
a piece of soap, and add the shavings to
a test tube with about 6 cm of water in
it. Carefully swirl the test tube to make
the soap dissolve, but not enough to
make it foam. You will need this solution
for some of the “soap experiments” to
come.
2. Add 2 cm of the soap solution to a fresh
test tube, insert the stopper, and shake
vigorously.
What do you see?
If it doesn’t foam up, your tap water is
rather “hard.” In that case, try repeating
step 2 with rainwater or distilled water.
1
2
6 CM
2 CM
“Hard” water contains large amounts of soluble
compounds, particularly calcium hydrogen carbonate
(calcium bicarbonate). When combined with soap, this
calcium compound forms insoluble lime soap, which has
no cleaning power. This kind of soapy water has none of
the foam formation required for cleaning.
→
WHAT’S HAPPENING?
28
EXPERIMENT 13
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Chemistry C500 (Version 2.0) |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 25520 MB |
