CHEM 212 Lecture Notes - Lecture 2: Absorbance, Sodium Chloride, Approximation Error
12 Sep 2016
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Separations: isolate compounds of a sample before quantifying. B. molarity= moles solute/l solution formality=#fws solute/l solution a. Acetic acid (ch3cooh) weak acid in equilibrium, thus [ch3cooh] < 1m & Formality concentration in all its possible species [ch3cooh]+[ch3oo-]= 1m: molality=moles solute/kg solvent, weight%= g solute/100g solution, volume%= ml solute/100ml solution. F. weight to volume%= g solute/100ml solution: parts per million= g solute/10^6 g solution (ppm, parts per billion= g/10^9 g solution (ppb) Calculate concentration of solutions from raw amount of materials. Determine quantity of reagents needed to make solutions of speci ed concentration. 1ppm= 1g/10^6 g material= 1micro g/g material and ppb= 1g solute/10^9 g materail or 1 ng solute/ g material. 1 ppm= 1g solute/10^6ml soln=1microg/ml soln=1mg solute/l soln. 1 ppb= 1g solute/10^9 soln=1ng solute/ml soln= 1micro g solute/l solution. Example: if a sample of drinking water contains 250ppm cl- whats is this concentration in molarity? atomic weight= 35. 5 g/mol.
