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Electrolysis — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis3 Marks
Question
Three different electrolytic cells A, B and C are connected in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of these observations.
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Answer

Electrolytic cell A has completely ionised sodium chloride solution. Thus, the ions can easily migrate to oppositely charged poles and hence the bulb glows brightly. To conclude sodium chloride solution is a strong electrolyte. Electrolytic cell B has a weak electrolyte as only 5% of the acetic acid molecules ionise. Thus, a weak current flows through it and hence the bulb glows dimly.
Electrolytic cell C has a non-electrolytic. Sugar molecules do not ionise and hence no current flows through it. Thus, the bulb does not glow.

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