Molarity
Presentation
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
Seth Harris
Used 86+ times
FREE Resource
10 Slides • 0 Questions
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Calculating Molarity and Molality
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Concentration
measure of the amount of solute in a given amount of solvent or solution
2 ways to measure
molarity- mol/L of solution
molality- mol/ g of solvent
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Molarity
number of moles of solute in one liter of solution
How to make
1. Determine desired molarity i.e. .5 M, 1 M
2. determine the mass needed by converting mol to gram
3. dissolve in less solvent than 1 L
4. Bring total solution to 1 L
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Molarity Problem #1
You have 3.5 L of solution that contains 90 g of sodium chloride, NaCl. What is the molarity of that solution?
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Problem #2
You have .8 L of a .5 M HCl solution. How many moles of HCl does this solution contain?
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Problem #3
A 23.4 g sample of potassium chromate is needed to carry out a reaction in aqueous solution of silver chromate. All you have on hand is 5 L of a 6.0M K2CrO4 solution. What volume of the solution is needed to give you the 23.4 g K2CrO4 needed for the reaction?
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Molality
Second way to express concentration of a solution
Moles of solute/ mass of solvent in kg
expressed by m
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Problem #1
A solution was prepared by dissolving 17.1 g of sucrose( table sugar, C12H22O11) in 125 g of water. Find the molal concentration of this solution.
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Problem #2
A solution of iodine, I2. in carbon tetrachloride, CCl4, is used when iodine is needed for certain chemical test. How much iodine must be added to prepare a .480 m solution of iodine in CCl4 if 100 g of CCl4 is used?
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Problem #3
What is the molality of acetone in a solution compose of acetone, dissolved in 200 g of water?
Calculating Molarity and Molality
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