Question

1. a) What is the effect of the concentration of an electrolyte on the conductance ( current)?

b). What is the cause of the differences in the conductances ( currents) of isomolar solutions of KNO3 and Ca(NO3)2 ?

c). Explain the presence of ionic impurities in ordinary tap water and the presence of molecular impurities in ordinary tap water.

Answer 1

1a)

if the concnetration of an electrolyte increases, then there are more ions in solutoin, therefore electorns flow easier, that is, current is higher

1b)

KNO3 = K+ and NO3-; there are only 2 ions compared with

Ca(NO3) = Ca+2 and 2NO3-; which have 3 ions, therefore more conductivity

1c)

ionic impurities ar eessentially dissolved solids from other salts

in tap water, it is pretty common to havE: Na+, K+; Cl-; Br-; Mg+2, CO3-2; Ca+2

molecular impurities --> all those organic relate substances such as methane, O2 dissolved, N2, chloroform, etc