Assuming complete dissociation, the total molar concentration of ions is three t

Question

Assuming complete dissociation, the total molar concentration of ions is three times the molarity of Na_2SO_4, or 1.05 M: 0.350 mol Na_2SO_4/1L times 3 mol ions/1 mol Na_2SO_4 = 1.05 M What is the molar concentration of Br^- ions in a 0.225 M aqueous solution of FeBr_3, assuming complete dissociation? Three different substances, A_2X, A_2Y, A_2Z, are dissolved in water, with the following results. (Water molecules are omitted for clarity.) Which of the substances is the strongest electrolyte, and which is the weakest? Explain.

Explanation / Answer

FeBr3---------.Fe+3 + 3Br-

So 1 mole of FeBr3 produces 3 mole of Br-

So 0.225M correspond to 3*0.225= 0.675M Br-

2. Compouns that dissociate compeltely in water are considered as strong electrolytes. Accordingly A2Y is stronger since it is dissociated more. There is less dissociation of A2X. Hence it is weak electrolyte.

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