1. Weigh out 8.0g of solid sodium hydroxide and dissolve it in 25cm3 of water in a beaker. 2. Pour the solution into a 100cm3 volumetric flask and rinse the beaker and weighing bottle with water, adding the rinse water to the flask. 3. Add distilled water dropwise until the solution reaches the 100cm3 mark. Shake well to mix.

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