CHEM 24112 Lecture Notes - Lecture 31: Molar Mass, Standard Solution, Potassium Dichromate
29 Jun 2018
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CHEMISTRY 112 – DAY 31 Chapter 15: Sections 4-5
4/6/18
MOLARITY AND DILUTIONS
Molarity: number of moles of solute per volume of solution in liters
M = molarity = =
EXAMPLE 1: Calculate the molarity of a solution prepared by dissolving 11.5 g of solid NaOH in enough water
to make 1.50 L of solution.
EXAMPLE 2: Calculate the molarity of a solution prepared by dissolving 1.56 g of gaseous HCl into enough
water to make 26.8 mL of solution.
EXAMPLE 3: Calculate the molarity of a solution prepared by dissolving 1.00 g of ethanol, C2H5OH, in enough
water to give a final volume of 101 mL.
EXAMPLE 4: Give the concentrations of all the ions in each of the following solutions: a) 0.50 M Co(NO3)2 and
b) 1 M FeCl3
EXAMPLE 5: Give the concentrations of the ions in each of the following solutions: a) 0.10 M Na2CO3 and b)
0.010 M Al2(SO4)3
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Document Summary
Molarity: number of moles of solute per volume of solution in liters. Example 1: calculate the molarity of a solution prepared by dissolving 11. 5 g of solid naoh in enough water to make 1. 50 l of solution. Example 2: calculate the molarity of a solution prepared by dissolving 1. 56 g of gaseous hcl into enough water to make 26. 8 ml of solution. Example 3: calculate the molarity of a solution prepared by dissolving 1. 00 g of ethanol, c 2h5oh, in enough water to give a final volume of 101 ml. Example 4: give the concentrations of all the ions in each of the following solutions: a) 0. 50 m co(no 3)2 and: 1 m fecl3. Example 5: give the concentrations of the ions in each of the following solutions: a) 0. 10 m na 2co3 and b) Example 7: to analyze the alcohol content of a certain wine, a chemist needs 1. 00 l of an aqueous 0. 200 m.
