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.