1. To prepare a 100 cm3 of 2 mol dm-3
sodium hydroxide solution
1 5 Add distilled water until
the calibration mark
Determine the mass of
solid sodium hydroxide Shake well
4
2
The mass of solid 3
sodium hydroxide
needed is weighed
Transfer the solution
to a 100 cm3
volumetric flask
Rinse the beaker and
Dissolve the solid sodium add the washing into
hydroxide in distilled water the flask

2. Prepare a standard solution
• To prepare a 100 cm3 of 2 mol dm-3 sodium hydroxide
solution
• Steps:
– Determine the mass of solid NaOH needed
– 8.0 g of solid NaOH is weighed in a weighing bottle by using
an electronic balance
– The solid NaOH is dissolved in about 25 cm3 of water into a
beaker
– The solution is poured into a 100cm3 volumetric flask.Why
step 5 is needed?
– The beaker and the weighing bottle are rinsed with distilled
water. The washings are then poured into the volumetric
flask.
– Distilled water is added into the volumetric flask and a
dropper is used to add water drop by drop to finally bring the
volume of solution to the 100 cm3 mark.
– The volumetric flask is stoppered, then inverted and shaken
until a homogeneous solution of NaOH is obtained

3. Prepare a solution with
dilution method
• To prepare 100 cm3 of 0.20 mol dm-3
sodium hydroxide solution from 2 mol dm-3
sodium hydroxide using dilution method
Dilution formula
M1V1 = M2V2
M1 = molarity of the solution before dilution
V1 = volume of the solution before dilution
M2 = molarity of the solution after dilution
V2 = volume of the solution after dilution

4. Prepare 100 cm3 of 0.2 mol dm-3
sodium hydroxide solution from 2.0
mol dm-3 sodium hydroxide solution
using dilution method
2
1
3
4