4S130 June 2011, Thursday

11.55 am – 1.05 pm

Electrolytes

Electrolytes = substances that can be conduct

electricity either in molten state or in aqueous solution & undergo chemical changes

Non-electrolytes = substances that cannot

conduct electricity either in molten state or in aqueous solution

Example of electrolytes:• acids: HCl, HNO3

• alkalis: NaOH, KOH• salt solution: NaCl(aq.)• molten salts: PbBr2

*ionic substances

Ionic compounds cannot conduct

electricity in solid state because the ions are held in a lattice & do

not move freely

Ionic compounds can conduct electricity in

molten state or aqueous sol. because

the ions are free to move around

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