Play  the presentation Chemical equations and calculations. Pay particular attention to the worked example before doing the example at the end of this post

 

Example to be handed in tomorrow

Hydrochloric acid solution was titrated with standard sodium hydroxide solution.

Before the titration the acid was diluted by making 1ml of solution up to 20ml(1:20) in a volumetric flask

20 ml samples of the acid in conical flasks were  titrated by running standard sodium hydroxide solution ( 0.15 molL-1 concentration) in from a burette using phenolphthalein indicator

Titration Results


Volume of hydrochloric acid=20ml

Titration

rough

titration 1

titration 2

titration 4

titration 5

Final volume (ml)

26.35

49.60

24.50

50.00

47.80

Initial volume (ml)

00.00

25.20

00.20

27.00

23.30

Titre (ml)

26.35

24.40

24.30

23.00

23.50


On your own paper:

  1. write the heading Titration Calculation
  2. Copy the table of results beneath
  3. select three concordant results and calculate the average titre
  4. Write down the balanced chemical equation for the reaction
  5. Use the method you have been shown to calculate the concentration of the hydrochloric acid