Titration of a weak acid with a strong base  ![]()
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Unknown Principle
During this experiment, the students create a measurement curve for a titration of a weak acid vs. a strong base. On top of that, the students will identify the titration curve's characteristics and determine the equivalence point.
In this experiment a weak acid (here: acetic acid, 0.1 M) of unknown concentration but known volume is filled into a vessel. The Cobra SMARTsense pH (alternatively the Cobra SMARTsense Dropcounter with a pH-electrode) is utilized to determine the pH value of the weak acid. The solution of a strong base with known concentration (here: sodium hydroxide, 1 M) is filled into the burette. The base is added in 1 ml steps to the acid, the pH value will be determined after every step. The equivalence point is determined with a suitable indicator (here: phenolphthalein).
Benefits - Experiment literature available for pupils and teachers: Minimum preparation time
- Simple teaching and efficient learning by using the available interactive experiment literature
Scope of delivery |
Cobra SMARTsense pH - Sensor for measuring the pH value 0 ... 14 (Bluetooth)
|
12921-00
|
1
| |
Support base, separable for 2 rods
|
02001-00
|
1
| |
Burette clamp, roller mount.,1pl.
|
37720-01
|
1
| |
Pipettor,bulb,3 valves,100ml max.
|
47127-02
|
1
| |
Pipettes with rubber cap, various sizes
|
64701-00
|
1
| |
Laboratory pen, waterproof, black
|
38711-00
|
1
| |
Erlenmeyer flasks, Boro, wide neck, various sizes
|
46151-00
|
1
| |
Protecting glasses, clear glass
|
39316-00
|
1
| |
Beaker, 50 ml, plastic (PP)
|
36080-00
|
2
| |
Wash bottle, 250 ml, plastic
|
33930-00
|
1
| |
Funnel, diameter = 40 mm, plastic (PP)
|
36888-00
|
1
| |
Graduated pipette, 5 ml : 0,1
|
36599-00
|
1
| |
Burette with straight glass stopcock, 10 ml
|
47152-03
|
1
| |
Stand rods, stainless steel, various sizes
|
02059-00
|
1
| |
Sodium hydroxide, pellets, 500 g
|
30157-50
|
1
| |
Acetic acid 99...100%, 500 ml
|
31301-50
|
1
| |
Phenolphthalein, 0,5% soution in ethanol, 100 ml
|
31715-10
|
1
| |
Buffer solution tablets pH4, 100
|
30281-10
|
1
| |
Buffer solution tablets pH10, 100
|
30283-10
|
1
|
|
Service
