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© 2013 Pearson Education, Inc. Chapter 8, Section 5 1
Learning Check
What is the molarity (M) of a solution prepared by diluting 10.0 mL of 2.7 M NaOH to 60.0 mL?
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 2
Solution
What is the molarity (M) of a solution prepared by diluting 10.0 mL of 2.7 M NaOH to 60.0 mL?
Step 1 Prepare a table of the concentrations and volumes of the solutions.
Analyze the Problem.
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 3
What is the molarity (M) of a solution prepared by diluting 10.0 mL of 2.7 M NaOH to 60.0 mL?
Step 2 Rearrange the dilution expression to solve for the unknown quantity.
Step 3 Substitute the known quantities into the dilution expression and calculate.
Solution
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 4
Guide to Calculations Involving Solutions in Chemical Reactions
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 5
Learning Check
How many liters of 3.00 M HCl are needed to completelyreact with 4.85 g of CaCO3?
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 6
Solution
How many liters of 3.00 M HCl are needed to completelyreact with 4.85 g of CaCO3?
Step 1 State the given and needed quantities.
Analyze the Problem.
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 7
Solution
How many liters of 3.00 M HCl are needed to completelyreact with 4.85 g of CaCO3?
Step 2 Write a plan to calculate the needed quantity or concentration.
mass molar moles mole–mole moles molarity litersof CaCO3 mass of CaCO3 factor of HCl HCl of HCl
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 8
Solution
How many liters of 3.00 M HCl are needed to completelyreact with 4.85 g of CaCO3?
Step 3 Write equalities and conversion factors including mole–mole and concentration.
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 9
Solution
How many liters of 3.00 M HCl are needed to completelyreact with 4.85 g of CaCO3?
Step 3 Write equalities and conversion factors including mole–mole and concentration.
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 10
Solution
How many liters of 3.00 M HCl are needed to completelyreact with 4.85 g of CaCO3?
Step 4 Set up the problem to calculate the needed quantity or concentration.
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 11
Learning Check
If 22 mL of 0.10 M MgCl2 is needed to completely react 15 mL of AgNO3 solution, what is the molarity of AgNO3?
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 12
Solution
If 22 mL of 0.10 M MgCl2 is needed to completely react15 mL of AgNO3 solution, what is the molarity of AgNO3?
Step 1 State the given and needed quantities. Analyze the Problem.
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 13
Solution
If 22 mL of 0.10 M MgCl2 is needed to completely react15 mL of AgNO3 solution, what is the molarity of AgNO3?
Step 2 Write a plan to calculate the needed quantity or concentration.
volume molarity moles mole–mole moles of MgCl2 MgCl2 of MgCl2 factor of AgNO3
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 14
Solution
If 22 mL of 0.10 M MgCl2 is needed to completely react15 mL of AgNO3 solution, what is the molarity of AgNO3?
Step 3 Write equalities and conversion factors including mole–mole and concentration.
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© 2013 Pearson Education, Inc. Chapter 8, Section 5 15
Solution
If 22 mL of 0.10 M MgCl2 is needed to completely react15 mL of AgNO3 solution, what is the molarity of AgNO3?
Step 4 Set up the problem to calculate the needed quantity or concentration.