CHEM 14BL Lecture Notes - Lecture 3: Equivalence Point, Sodium Chloride, Titration
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28 Feb 2017
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Molarity: moles/l, independent of reaction, must know what you have, molecular weight = sum of atomic weights in molecule, is theoretical. Normality: equivalents/l, depends on reaction, can determine for an unknown, equivalent weight = weight of compound that reacts with 1 mole of h + and oh - , is experimental. For acids or bases with only one h + or oh - or that react with only one. For example, hcl, hno 3 naoh, nh 3 , and the equivalent weight must be equal to the molecular weight. For reacting with more than one mole of h + or oh - , the normality > molarity. Examples are h 3 po 4 , h 2 so 4 , and the equivalent weight is less than the molecular weight. You should write acid-base reactions for each of these compounds and determine the molecular weight and the equivalent weight.
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