Colourimetry

Question 1

What is the Initial Concentration ?

Answer 1

0.002mol/l

Question 2

What happens if there is Paracetamol ?

Answer 2

Higher concentration

Question 3

What was the aim of the experiment ?

Answer 3

Estimate the unknown concentration of the molecule in a solution .

Unknown calculated on graph using the equation :y=mx+b

Question 4

What do nano metres do ?

Answer 4

Were the measurement used
Absorbance 430nm
Using the spectrometer (plate reader)

Question 5

The paracetamol stock needs to be converted ? To micrometres

Answer 5

0. 2ul=200ml
1. 4ul=400ml
2. 6ul=600ml

Question 6

What is the equation used in this particular experiment ?

Answer 6

c1 v1=c2v2

Question 7

Using the dilution factors
Make 300ul of a 1:250 dilutions

Final volume /solute volume

Answer 7

300ul /250 =1.2ul

300-1.2ul=298.8ul

Question 8

If I add 25 ml of water to 125 ml of a 0.15 M NaoH solution , What will the molarity be ?

Answer 8

25 divided by 1000=0.25L
125 divided by 1000=0.125L
0.15 M

0.15 x 0.125 divided by 0.15 L .

Question 9

If I leave 750mL of a 0.50 M sodium chloride solution uncovered on wind lane, 150mL of solvent evaporates , what will the new concentration be ?

To what Volume would I need to add water to evaporate solution in above question to get solution of 0.25M ?

Answer 9

750 -150=600 divided by 100 =0.6L
750 divided by 1000=0.75 L

0. 50M times 0.75 divided by 0.6 =0.625m
1. 625x0.6 divided by 0.25 M = 1.5