of 6ĥ Molality of H 2 SO fraction of H 2 SO Concept Check Which of the following does not exist in aqueous solution? a. What is the concentration of this solution in the following concentration units? molarity of H 2 SO Spring 2016 (Ratcliff) Everything in life comes to you as a teacher. What is the concentration of this solution in the following units? Mole fraction of glucose Mass percent (w/w) of glucose X= Molality of glucose 16.0 % _PSV_02_conc_04 The density of a 16.0 % (w/w) solution of sulfuric acid (H 2 SO 4 ) in water is g/ml at 25.0 ✬. of 6Ĥ 116_PSV_02_conc_03 A M solution of glucose, C 6 H 12 O 6 in water has a density of g/ml at 20 ✬. What is the fraction of MgCl 2 in the solution? X MgCl2 = 0.12 Spring 2016 (Ratcliff) Everything in life comes to you as a teacher. 116_PSV_02_conc_01 Determine the concentration of H 2 SO 4 in a solution prepared by dissolving 25.0 g of H 2 SO 4 in 1.30 of water in the following units? wt % (w/w) of H 2 SO 4 fraction of H 2 SO 4 Wt %(H 2 SO 4 ) = 1.89 % Molality of H 2 SO 4 X H2SO4 = m = _PSV_02_conc_02 A solution is 7.5 m MgCl 2. The methanol solution contains three times as many particles as the salt solution.
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The salt solution contains twice as many particles as the methanol solution.
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They contain the same number of solute particles c. Neither solution contains solute particles. of 6ģ Concept Check Which contains more solute particles: a 0.10 M aqueous solution of methanol (CH 3 OH) or a 0.10 M aqueous solution of salt (NaCl)? a. of 6Ģ Molality tells you how many s of solute are present in every kilogram of solvent molality, m = s solute solvent Mole Fraction Concentration Units/ Summary units Advantages Disadvantages Molarity, M s Useful in stoichiometry Temperature dependent s solute M = M V= if V is in liters Must know density to find soln solvent mass Mole fraction, X i s of i X i = total s None, unitless Temperature independent useful in special applications Must know density to convert to molarity Mass percent, % (m/m) massi % = 100% mass soln % Temperature independent useful for small amounts Must know density to convert to molarity Molality, m s s solute m = solvent Temperature independent used in special applications Must know density to convert to molarity Spring 2016 (Ratcliff) Everything in life comes to you as a teacher. % volume solution ( w/v) = 100% Related concentration Units: parts per million, ppm parts per billion, ppb = mass solution mass solution (1 10 ( ppm) ppb) Spring 2016 (Ratcliff) Everything in life comes to you as a teacher. Mole Fraction Molarity, M tells you how many s of solute are present in every liter of solution (solute-to-solution) s of solute Molarity, M = liters of solution Weight Percent (Wt %), parts per million (ppm) and parts per billion (ppb) The weight-weight percent, tells you how many grams of solute are present per hundred grams of the solution % mass solution ( w/w) = 100% The weight-volume percent tells you how many grams of solute are present per 100 m of solution.