Inveromental chemistry

1. Task 4. Writing the procedure
Write the procedure for preparing following solutions:
Solution of Concentration Solvent Source Purpose
HCl 0.1 M
100.00 ml
water Concentrated
HCl water
solution
As a titrant for
acid-base
titration
KNO3 10%
200 ml
water KNO3
lab.grade
As ionic
species (for
increasing
conductivity of
solutions)
NaOH 0.2 M ethanol NaOH 99.99%
Ethanol
(anhydrous,
99.0%)
For organic
synthesis
What is necessary:
Equipment;
Glassware;
Primary solutions?
Any requirements for them?

3. Preparation Procedure: HCl
Take a 100ml volumetric flask, drop some distilled water about 80ml, then drop 8.28ml of
concentrated HCl solution, and then drop some more distilled water into the flask till the
volume of the solution reach the 100ml line in the flask, shake it 5 times and your solution
is ready.
Preparation Procedure: KNO3
Take a 200ml volumetric flask, drop some distilled water about 150ml, then drop 44.764g
of Lab. Grade Potassium nitrate, shake it to dissolve the salt into distilled water, and then
drop some more distilled water into the flask till the volume of the solution reach the
200ml line in the flask, shake it 5 times and your solution is ready.
Preparation Procedure: NaOH
The volumetric amount of solution to be made is not known.

4. Task 2. Calibration of volumetric labware
Prepare the detailed procedure how to calibrate the following volumetric dishes:
25-ml volumetric flask or 5-ml Mohr pipette;
And 1-ml pipette-dosator.

5. 25ml Volumetric flask
1. First, we should be sure that the flask is clean and empty of any
substance.
2. Find the weight of the volumetric flask and to be noted.
3. Should get the distilled water in 4oC.
4. Take 25ml distilled water by a pipette and put it into flask.
5. Find the weight of the water containing flask.
6. Find the weight of the water (difference of the two states of flask).
7. Calculate the volume of the dropped water.
8. Repeat these processes for 5 times and then see volume result.
9. You can find that the real volume of the flask.

6. 1ml pipette-dosator
1. Do the calibration processes as the volumetric flask but a little
different
2. Take a flask or any other thing on the analytical wight balance.
3. Take 1ml of distilled 4oC water by pipette-dosator and drop the water
to the flask.
4. Find the water’s wight.
5. Do this process 5 times, and then you can find the real volume of the
pipette-dosator.

7. Hand write: