1.

Calculate the molality of 0.2M nacl solution

Answer»

NaCl dissociates in a 1:1:1 RATIO according to the equation:

NaCl --> NA+ + CL-

So, based on this ratio if you have 0.2 molar NaCl you will get 0.2 molar Na+ and Cl-. The 1:1:1 ratio means that the molarity of each of the ions will be the same as the molarity of NaCl.

Contrast this to the SITUATION for MgCl2. This dissociates in a 1:1:2 ratio:

MgCl2 --> Mg2+ + 2Cl-

In this case if you have 0.2 molar MgCl2, it will dissociate to give 0.2 molar Mg2+ but 0.4 molar Cl- because there are twice as MANY Cl- ions as MgCl2 particles.


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