User:Phaello/sandbox/Chemistry/Molality

=Molality=

molality = no. of moles of solute/weight of solvent in Kg

molarity = no. of moles of solute/volume of solution in L

NOTE:

Weight given is that of solution

Weight of solution is = to weight of solvent + weight of solute

=Molality and Molarity Conversions=

{{Discussion|
 * Density of a solution is the mass of solution divided by volume of the solution
 * Remember: Density is mass (g)/volume (ml) or mass (kg)/volume (L)
 * Density of water may be taken as 1g per 1ml
 * If you dissolve sodium chloride in water, will the mass of 1 ml of the solution be 1g, less than 1g or more than 1 g?
 * When you dissolve more NaCl to the water, will that increase the mass of 1ml or not?

In other words
}}
 * the density of the solution increases with increased concentration of the solution
 * Density changes with concentration
 * If you are given the concentration of a solution and its density, then you can calculate the molality of the solution
 * Don't forget molarity is about moles per volume of solution
 * While molality is about moles per weight of the solvent