10.07.2015 Views

Concentration Terms and Calculations - Quantum

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Check whether the answer isreasonable.The volume of a soda can is 1/3 L. 0.1 moles of sucrose isneeded; the answer is reasonable.How to calculate grams of solute in a given volume of solutionA physiological saline solution is 0.154 M NaCl. How many grams of sodium chloride are in 500. mL ofthe solution?Solution:Write down the given values with theirunits <strong>and</strong> what they represent.In this problem, molarity is given for the solute NaCl <strong>and</strong>the solvent water. The molar masses of Na <strong>and</strong> Cl can beobtained from the Periodic Table.M NaCl = 0..154 mol NaCl/L salineV saline = 500. mL1 mol Na = 22.99 g/mol1 mol Cl = 35.45g/molmolar mass NaCl = 58.44 g/molWrite down the unknown <strong>and</strong> its unit.The grams of NaCl in 500. mL of saline is unknown.g NaCl = ?Develop a strategy to solve the problem.The definition of molarity isA dimensional analysis problem is set up to give g NaCl in500. mL saline.

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