Volumetric analysis
exercise 5
|
Volume
|
Volume
|
Volume
|
|
| Start |
11.40
mls
|
22.43
mls
|
13.40
mls
|
| Finish |
21.22
mls
|
32.22
mls
|
23.22
mls
|
| Total |
An alumina refinery puts out waste water into the local stream with a suspected high concentration of NaOH. 25ml aliquots of fthe contaminated water were titrated against a 0.085M HCl solution. The results are shown on the left. Calculate the concentration of NaOH in the waste water.
The equation for the reaction is shown below.
Step 1 Calculate
the mole of substance delivered from the burette. In this case HCl solution
Mole = Average Volume(litres)
X Concentration
Step 2 Using the equation calculate the number of mole of substance in the test sample. In this case NaOH
Step 3 Find the concentration of the substance in the test sample. In this case find the concentration of NaOH in the 25 ml aliquot.