Selecting an indicator for titration

LC1.4.5.4
Selecting an indicator for titration
Selecting an indicator for titration

Description

In this experiment the students analyse three different indicators. For this, they use the indicators methyl orange, bromothymol blue and phenolphthalein in the titration of sodium hydroxide solution against hydrochloric acid. They measure the pH value at the turnover point of the indicator with pH paper. The students realise that the turnover point of the indicator does not necessarily correspond to the equivalence point. The students learn that not every indicator is suitable for every titration and can estimate which indicator they should use for this titration.

Components of equipment sets

1 6749040  4 
Silicone high vacuum grease, 75 g LD
1 665997  4 
Graduated pipette 10 ml LD
1 666003  4 
Pipetting ball (Peleus ball) LD
1 30121  8 
Stand base MF LD
2 301271  4 
Stand rod 40 cm, 10 mm Ø LD
1 30123  4 
Stand feet, pair LD
1 30109  4 
Bosshead S LD
1 666555  4 
Universal clamp 0...80 mm LD
1 665212  4 
Glass stirring rod 200 x 8 mm Ø LD
1 MA90204  8 
Universal indicator paper pH 1...14, roll LD
3 602022  4 
Beaker Boro 3.3, 100 ml, squat LD
1 664131  4 
Beaker Boro 3.3, 400 ml, squat LD
1 665843  4 
Burette clear glass, 10 ml, side stopcock LD
1 665816  4 
Burette filling funnel plastic, 35 mm Ø LD
1 610010  8 
Laboratory safety goggles LD
1 6738411  4 
Sodium hydroxide solution, 0.1 mol/l, 1 l LD
GHS05 Warning H290
1 6746960  4 
Hydrochloric acid, 0.1 mol/l, 1 l LD
GHS05 Warning H290
1 6710800  4 
Bromothymol blue solution, 0.1 %, 50 ml LD
1 6733050  4 
Methylene orange solution, 0.1 %, 100 ml LD
1 6742500  4 
Phenolphthalein solution, 100 ml LD
GHS02GHS07 Danger H225 H319
1 6753410  4 
Water, pure, 5 l LD
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