What is the osmolarity of 0.5*mol*L^-1 solution of magnesium sulfate?

1 Answer
anor277
Aug 11, 2017

The "osmolarity" of 0.5*mol*L^-1 MgSO_4 is 1.0*mol*L^-1....

Explanation:

"Osmolarity" is the concentration of a solution expressed as the total number of "solute particles" per litre.....

In aqueous solution, magnesium sulfate speciates to give two moles of ions.......i.e.

MgSO_4stackrel(H_2O)rarrMg^(2+) + SO_4^(2-)

Charge and mass are balanced as is absolutely required.

And since magnesium sulfate gives rise to TWO EQUIVS of soluble ions, the osmolarity is equal to TWICE the molarity of Na_2SO_4. What is the osmolarity of 0.5*mol*L^-1 Al(NO_3)_3.....?

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