Titration of a strong acid with a strong base with the aid of several indicators Principle The aim of this experiment is to show and explain to the students how indicators can be used in analytical chemistry and to familiarise them with the fundamental principles of titration. Futhermore, a special focus is set on indicators and their various colour transition ranges. During this experiment, the students have to determine the unknown concentration of hydrochloric acid (solution to be analysed) with the aid of several indicators. For this purpose, a known volume of the acid is titrated with a volume of a sodium hydroxide solution of a known concentration (standard solution) until the indicator changes colour. The used volume of the standard solution and its concentration are then used to calculate the concentration of the solution being analysed. Learning objectives - Titration of a strong acid
Benefits - Experiment literature available for pupils and teachers: Minimum preparation time
- Simple teaching and efficient learning by using the available interactive experiment literature
Burette with straight glass stopcock, 10 ml
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47152-03
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1
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Pipette with rubber bulb
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64701-00
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1
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Beaker, 50 ml, plastic (PP)
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36080-00
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1
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Funnel, diameter = 40 mm, plastic (PP)
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36888-00
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1
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Graduated pipette, 5 ml : 0,1
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36599-00
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1
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Protecting glasses, clear glass
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39316-00
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1
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Pipettor,bulb,3 valves,100ml max.
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47127-02
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1
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Burette clamp, roller mount.,1pl.
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37720-01
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1
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Support base, variable
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02001-00
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1
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Stand rods, stainless steel, various sizes
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02059-00
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1
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Wash bottle, 250 ml, plastic
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33930-00
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1
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Laboratory pen, waterproof, black
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38711-00
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1
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Phenolphthalein, 0,5% soution in ethanol, 100 ml
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31715-10
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1
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Methyl orange soln., 0.1% 250 ml
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31573-25
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1
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Bromothymol blue, 0.1% sol. 50 ml
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48004-05
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1
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Water, distilled 5 l
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31246-81
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1
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Hydrochloric acid 37 %, 1000 ml
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30214-70
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1
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Sodium hydroxide, pellets, 500 g
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30157-50
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1
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Erlenmeyer flasks, Boro, wide neck, various sizes
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46151-00
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1
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