PLEASE SOMEONE MAKE UNDERSTAND THESE ACTIVITIES WITH SOLUTION???
(a) Remove the shell of an egg by dissolving
it in dilute hydrochloric acid. The shell
is mostly calcium carbonate. A thin
outer skin now encloses the egg. Put
the egg in pure water and observe after
The egg swells because water passes
he Activity
he
Osmosis with an egg
1 a
ia
ell
5 minutes. What do we observe?
It
into it by osmosis.
(b) Place a similar de-shelled egg in a
concentrated salt solution and observe
for 5 minutes. The egg shrinks. Why?
Water passes out of the egg solution
into the salt solution because the salt
solution is more concentrated.
We can also try a similar activity with dried
raisins or apricots.
Activity
5.4
Put dried raisins or apricots in plain
water and leave them for some time.
Then place them into a concentrated
solution of sugar or salt. You will
observe the following:
(a) Each gains water and swells when
placed in water.
(b) However, when placed in the
concentrated solution it loses water,
and consequently shrinks.
Answers
Answer:
Dry apricots have more solutes than pure water. Hence, the endosmosis, i.e., water molecules will move from outside to the inside of the apricot through the wall of apricot. Due to this, apricots will swell eventually. When such apricots are transferred to the sugar solution, then the solution will be the hypertonic bearing high amount of solute. Hence, exosmosis, i.e., water will move from inside to the outside of apricot through the apricot wall. Due to this, apricot will shrink.
If you soak this egg shell in vinegar (which is about 4% acetic acid), you start a chemical reaction that dissolves the calcium carbonate shell. The acetic acid reacts with the calcium carbonate in the egg shell and releases carbon dioxide gas that you see as bubbles on the shell.
Answer:
Yes ,correct answer......................