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Selecting an indicator for titration - Digital

LC1.4.5.4C
Selecting an indicator for titration - Digital
Selecting an indicator for titration - Digital

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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 a pH electrode. 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.

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1 6749040  4 
Silicone high vacuum grease, 100 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
2 30109  4 
Bosshead S LD
2 666555  4 
Universal clamp 0...80 mm LD
1 665212  4 
Glass stirring rod 200 x 8 mm Ø LD
3 602022  4 
Beaker Boro 3.3, 100 ml, squat LD
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Beaker Boro 3.3, 400 ml, squat LD
1 665843  4 
Burette side stopcock, 10 ml LD
1 665816  4 
Burette filling funnel plastic, 35 mm Ø LD
1 610010  8 
Laboratory safety goggles LD
1 524005W2
Mobile-CASSY 2 WiFi LD
1 524452  8 
pH Adapter M LD
1 529673  8 
pH combination electrode, BNC LD
1 6744670  4 
Buffer solution pH 7.00, 250 ml LD
1 6744640  4 
Buffer solution pH 4.00, 250 ml 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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