Chapter 8 Solution

1
Chapter 8Solution

• Percent Concentration

2
Percent Concentration

• Describes the amount of solute dissolved in 100
  parts of solution
• amount of solute
• 100 parts solution

3
Mass-Mass Concentration

• mass/mass g solute x 100
  100 g solution

4
Mixing Solute and Solvent

• Solute Solvent
• 4.0 g KCl 46.0 g H2O
• 50.0 g KCl solution

5
Calculating Mass-Mass

• g of KCl 4.0 g
• g of solvent 46.0 g
• g of solution 50.0 g
• (m/m) 4.0 g KCl (solute) x 100 8.0
  KCl
• 50.0 g KCl solution

6
Learning Check PC1

• A solution contains 15 g Na2CO3 and 235 g of
  H2O? What is the mass of the solution?
• 1) 15 (m/m) Na2CO3
• 2) 6.4 (m/m) Na2CO3
• 3) 6.0 (m/m) Na2CO3

7
Solution PC1

• mass solute 15 g Na2CO3
• mass solution 15 g 235 g 250 g
• (m/m) 15 g Na2CO3 x 100
  250 g solution
• 6.0 Na2CO3 solution

8
Mass-Volume

mass/volume g solute x 100
100 mL solution
9
Learning Check PC2

• An IV solution is prepared by dissolving 25 g
  glucose (C6H12O6) in water to make 500. mL
  solution. What is the percent (m/v) of the
  glucose in the IV solution?1) 5.0 2) 20.
  3) 50.

10
Solution PC2

• 1) 5.0
• (m/v) 25 g glucose x 100
• 500. mL solution
• 5.0 (m/v) glucose solution

11
Writing Factors from

• A physiological saline solution is a 0.85 (m/v)
  NaCl solution.
• Two conversion factors can be written for the
  value.
• 0.85 g NaCl and 100 mL NaCl soln
• 100 mL NaCl soln 0.85 g NaCl

12
(m/m) Factors

• Write the conversion factors for a 10 (m/m)
  NaOH solution
• NaOH and
  NaOH soln
• NaOH soln NaOH
  

13
(m/m) Factors

• Write the conversion factors for a 10 (m/m)
  NaOH solution
• NaOH and
  NaOH soln
• NaOH soln
  NaOH

10 g
100 g
100 g
10 g
14
Learning Check PC 3

• Write two conversion factors for each of the
  following solutions
• A. 8 (m/v) NaOH
• B. 12 (v/v) ethyl alcohol

15
Solution PC 3

• Write conversion factors for the following
• A. 8 (m/v) NaOH
• 8 g NaOH and 100 mL
• 100 mL 8 g NaOH
• B. 12 (v/v) ethyl alcohol
• 12 mL alcohol and 100 mL
• 100 mL 12 mL alcohol

16
Using Factors

• How many grams of NaCl are needed to prepare
  250 g of a 10.0 (m/m) NaCl solution?
• Complete data
• ____________ g solution
• ____________ or (______/_100 g_) solution
• ____________ g solute

17
Clculation Using Factors

• 250 g solution
• 10.0 or (10.0 g/100 g) solution
• ? g solute
• 250 g NaCl soln x 10.0 g NaCl 25 g
  NaCl 100 g NaCl soln

18
Learning Check PC4

• How many grams of NaOH do you need to measure
  out to prepare 2.0 L of a 12(m/v) NaOH solution?
• 1) 24 g NaOH
• 2) 240 g NaOH
• 3) 2400 g NaOH

19
Solution PC4

• 2.0 L soln x 1000 mL 2000 mL soln
• 1 L
• 12 (m/v) NaOH 12 g NaOH
• 100 mL NaOH soln
• 2000 mL x 12 g NaOH 240 g NaOH
  
• 100 mL NaOH soln

20
Learning Check PC5

• How many milliliters of 5 (m/v) glucose
  solution are given if a patient receives 150 g of
  glucose?
• 1) 30 mL
• 2) 3000 mL
• 3) 7500 mL

21
Solution PC5

• 5 m/v factor
• 150 g glucose x 100 mL 3000 mL
• 5 g glucose