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In biology, percentage solutions are often preferred to molar solutions. A 1% solution would have 1 g of solute dissolved in a final volume of 100 ml of solution. This would be labeled as a weight/volume [w/v] percentage solution. For w/w, both solvent and solute would need to be weighed in the required ratios. Volume would accordingly be measured using a measuring cylinder, volumetric flask, pipette or similar. Labels should show what the percentage relationships are (w/v, w/w or v/v).
This is done by dividing the weight of the product in g with the volume in mL. Therefore the equation is Mass(g) / Volume(mL)x100 = %
The molarity of a percentage solution (w/v) can be calculated using the molar mass of the solute used. For example, sucrose (table sugar) has a molar mass of a 342.34 g/mol. A 1% sucrose solution (100ml, w/v), therefore, is 0.029 molar, or 29 mM.
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