The ionic strength of 0.2M sodium hydrogen phosphate solution will be:

CSIR NET 2015

Ionic strength = ½ ∑(concentrations of ions * charge2)

= ½  [(0.4 *12) +( 0.2 * (-2)2 ]

= ½ [0.4 +0.8] = 0.6M

                                                   

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