MolE11
Make molar solutions
for microscale chemistry
Attention: both liquids are corrosive!
A 1-molar solution contains
1 mol solute per litre (=1000 ml) of solution.
Material
Tray, 10-mL dropper bottle, digital pocket scale, plastic funnel, syringes 1 ml, 5 mL,
CD marker, photo 2: sodium hydroxide granules in
a film canister, HCl conc., NH3 conc.
Experiment
Wear
goggles. Do not loose one granule or touch one.
Open the canister above the tray, close it immediately after transferring 0,4 g to the
bottle.
1.
Label the dropper bottle with a safety symbol. Transfer 10 mL water to it
and mark the surface.
After removing the water you have made a 10 mL measuring
cylinder.
2. (Photo 1)
Place the dry dropper bottle and the funnel
on the digital scale, tare it (0.0 g) by pressing the red button.
3. Carefully add 0.4 g granules of sodium
hydroxide (Photo 2).
4.
Close the canister, remove the scale, fill up with water to the 10-mL mark.
5. Close the bottle and shake for complete solution.
6. Ask the teacher to give you (Photo 3):
for hydrochloric
acid (1M HCl) => 0,8 mL of concentrated hydrochloric acid (HCl
conc),
for solution of ammonia (1M NH3)
=> 1.2 mLconc solution of ammonia (NH3 conc).
7. Fill up with water to
the mark, close the bottles and shake them.