Solutions Percent Concentration Describes the amount of solute dissolved in 100 parts of solution...
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Transcript of Solutions Percent Concentration Describes the amount of solute dissolved in 100 parts of solution...
Solutions
Percent Concentration
Percent Concentration
Describes the amount of solute dissolved in 100 parts of solution
amount of solute
100 parts solution
Mass-Mass % Concentration
mass/mass % = g solute x 100% 100 g solution
Mixing Solute and Solvent
Solute + Solvent
4.0 g KCl 46.0 g H2O
50.0 g KCl solution
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
Grams, Moles & %Composition
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
Solution
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
Mass-Volume %
mass/volume % = g solute x 100% 100 mL solution
Moles & Volume & %Composition
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.%
Solution
1) 5.0%
%(m/v) = 25 g glucose x 100
500. mL solution
= 5.0 %(m/v) glucose solution
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
% (m/m) Factors
Write the conversion factors for a 10 %(m/m) NaOH solution
NaOH and NaOH soln
NaOH soln NaOH
% (m/m) Factors
Write the conversion factors for a 10 %(m/m) NaOH solution
NaOH and NaOH soln
NaOH soln NaOH
10 g
10 g100 mL
100 mL
Moles, Volume & %Composition
Write two conversion factors for each of the following solutions:
A. 8 %(m/v) NaOH
B. 12 %(v/v) ethyl alcohol
Solution
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
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
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 NaCl100 g NaCl soln
Calculations using %Compostion
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
Solution
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
Moles, Volume & %Composition
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
Solution
5% m/v factor
150 g glucose x 100 mL = 3000 mL
5 g glucose