|
|
Aids
and chemicals
Beaker
egg shell, 8 % solution of
acetic acid (CH3COOH) - vinegar.
|
| Working
process:
| Break
egg shell into a beaker and pull as much vinegar as
cover the whole shell. Observe the changes. |
[ Back
]
|
Observation
Po chvíli sa na povrchu vaječnej škrupiny
začnú tvoriť malé bublinky, ktoré časom unikajú k hladine.
|
Interpretation
Egg shell contains 97 % mineral
substances. 93 % of them are formed into calcium carbonate
(CaCO3) and the rest is magnesium carbonate (MgCO3)
and phosphates.
KWhen vinegar - 8 % solution of acetic
acid is pulled on egg shell, calcium carbonate reacts with
acetic acid and calcium salt of acetate acid is formed. The
product of this reaction is CO2 that evolves as
bubles.
|
| Exhalate
annihilation No
dengerous substances is formed in the experiment. All glass
can be washed by water.
|
| Between
- subject relationsheeps The
content of the experiment belongs to the study material to 6th
class at Basic School.
[ Back
]
|
| Time
requirement
10 minutes
|
| Experiment
ordering
Student´s experiments to the topic:
1st class of High
School: s2 element compounds
|
