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Unformatted text preview: -variable that measures amount of substance per unit volume (molarity = M)-molarity – amount of solute in moles present in a liter of solution = mol/L-concentration is a relative quantity-Calculate concentration in M of 25g NaOH which is dissolved in 0.5L solution.-25g x (1 mol/40g) = .625 mol/.5L = 1.25M NaOH Preparing solutions:-use volumetric glassware (volumetric flasks)-bottom of meniscus touches line-solutions can be made from:-a solid and water-a more concentrated solution and water-ex: prepare 2L of .5M NaOH solutions. How do we do this?-add solid to volumetric fask-add water (shake/stir until meniscus sits on line)-MxV = .5mol/L (2.0L) = 1mol NaOH x 40g/1mol = 40.0gNaOH-1: get volumetric flask (2L flask)-2: add 40.0gNaOH to flask-3: add H2O until it reaches line...
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