A solution is made by dissolving 20.0 g of sodium chloride in 100 g of water. The final volume of the solution is 110. Ml. What is the molarity of the solution?

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How do i solve this? And whats the formula to solve it?

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Answer 1 · 2018-05-16T14:14:28

By definition, #"molarity"="moles of solute"/"volume of solution"#...you just simply have to know this definition.

And so #"molarity"# is another concentration term and we have the data to solve for it here...

#=((20.0*g)/(58.44*g*mol^-1))/(110xx10^-3*L)=3.11*mol*L^-1#

Another concentration term is #"molality..."#, defined by the quotient...

#"molality"="moles of solute"/"kilograms of solvent"#

...and of course we could recalculate this....

#=((20.0*g)/(58.44*g*mol^-1))/(100*gxx10^-3*kg*g^-1)=3.42*mol*kg^-1#

At weaker concentrations, #"molality"# approaches #"molality"#...