Salts, acids and bases are electrolytes. In pure form they do
not (or hardly) conduct electric current, because in this condition
they have no (or only extemely few) freely mobile electrons. In
water, the dissolved electrolyte divides (dissociates) into
positive and negative ions.
When voltage is applied to two electrodes which are dipped into an
aqueous solution of an electrolyte, the ions migrate towards the
electrode which has the opposite electric charge. Aqueous solutions
of electrolytes are therefore capable of conducting electric
current.
The students should find this out in this experiment, and also get
to understand why an electrolyte which is not dissolved (or not
melted) as well as distilled water are not conductive, or
hardly so.
You will determine if water containing dissolved substances
conducts electric current.
| Materiallist (Excerpt) |
Product |
Amount |
|
Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V
|
13505-93
|
1
|
|
Multi-range meter, analogue
|
07028-01
|
2
|
|
On-off switch module, SB
|
05602-01
|
1
|
|
Interrupted connector module, SB
|
05601-04
|
2
|
|
Water, distilled 5 l
|
31246-81
|
1
|
|
Sodium hydroxide sol.,10%, 1000ml
|
31630-70
|
1
|
|
Junction module, SB
|
05601-10
|
2
|
|
Angled connector module with socket, SB
|
05601-12
|
2
|
|
Sulphuric acid, 10%, tech.gr., 1000 ml
|
31828-70
|
1
|
|
Angled connector module, SB
|
05601-02
|
2
|
|
Straight connector module, SB
|
05601-01
|
1
|
|
Trough, grooved, w/o lid
|
34568-01
|
1
|
|
Emery paper, medium, 5 sheets
|
01605-02
|
1
|
|
Alligator clips, bare, 10 pcs
|
07274-03
|
1
|
|
Connecting cord, 32 A, 500 mm, red
|
07361-01
|
2
|
|
Connecting cord, 32 A, 500 mm, blue
|
07361-04
|
2
|
|
Connecting cord, 32 A, 250 mm, red
|
07360-01
|
2
|
|
Connecting cord, 32 A, 250 mm, blue
|
07360-04
|
2
|
|
Copper electrode 76x40 mm
|
45212-00
|
2
|
|
Spoon,w.spatula end,18 cm,plastic
|
38833-00
|
1
|
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