Chapt_13revC - Henry’s Law Henry’s Sg = kPg kP where...

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Unformatted text preview: Henry’s Law Henry’s Sg = kPg kP where where Sg is the solubility of the gas k is the Henry’s law constant for that gas in that solvent; for Pg is the partial pressure of the gas above the liquid. the Effect of T on solubility of crystals crystals Generally, the solubility of solid solutes in liquid Generally the solid solvents increases with increasing temperature. solvents Effect of T on solubility of gases Effect The opposite is true The of gases: Carbonated soft drinks are more “bubbly” if stored in the refrigerator. Warm lakes have less O2 dissolved in less them than cool lakes. lakes. Constant pressure STOPPED Ways of Expressing Concentrations of Solutes in Solutions Solutes Mass Percentage Mass Mass % of A = mass of A in solution × total mass of solution 100% Parts per Million and Parts per Billion Parts Parts per Million (ppm): mass of A in solution ppm = total mass of solution × 106 Parts per Billion (ppb): mass of A in solution ppb = total mass of solution × 109 Mole Fraction (X) moles of A moles XA = total moles in solution Xtotal = XA + XB + XC + …. Molarity (M) mol of solute mol M= L of solution Because volume is temperature Because dependent, molarity can change with temperature. with WHY ? Molality (m) mol of solute mol m= kgram of solvent Is this T dependent ? Why? Because both moles and mass do Because moles mass not change with temperature, molality is not temperature not dependent (unlike molarity) . dependent Solution measure Calculations Solution Freezing Point Depression Freezing Dissolving oils in water ...
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