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Measuring the strength of alkalis using electrical conductivity

Answer Text:
Measuring the strength of alkalis Using electrical conductivity:
Procedure
50#cm^3# of 2 M sodium hydroxide solution is put into a beaker and the apparatus set as shown below
Apparatus
Procedure
-The same procedure is repeated using other alkalis like #NH_4OH#; #Ca (OH)_2# e.t.c.
Observation
- The bulb lights brightly with KOH and NaOH as
electrolyte than with NH4OH and #Ca (OH)_2#
Explanation
- NaOH and KOH are strong alkalis and are completely dissociated and have more ions in solution and hence have got a higher electrical conductivity than the weak alkalis of NH4OH and #Ca(OH)_2#(aq)