Question

Determine the ionic strength, μ, for each of the following solutions. Assume complete dissociation of each...

Determine the ionic strength, μ, for each of the following solutions. Assume complete dissociation of each salt and ignore any hydrolysis reactions.

a) A solution of 0.00490 M HCl

b) A solution of 0.00213 M CaBr2

c) A solution of 0.000850 M CaBr2 and 0.000489 M NaBr

Homework Answers

Answer #1

The relationship between the ionic strength and molar concentration and charge of the ions is-

µ =1/2∑cizi2 (I =1 to n), where ci is the concentration of the particular ion and zi is the charge of that ion.

So for the HCl solution, HCl = H+ + Cl-, strong electrolyte, equal concentration and 1 unit of charge each.

(a) µ=1/2[0.0049*(1)2*2] = 0.0049 M

For CaBr2 à Ca2+ + 2Br-

(b) µ=1/2[0.00213*(2^2) + 2*0.00213*1^2] = 0.00639 M

For the mixed salts, NaBr = Na+ + Br- and CaBr2 à Ca2+ + 2Br-

(c) µ = ½[0.000489*2 + (0.000850*4 + 2*0.000850)] = 0.003039 M

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