% concentration =
g solute___ x 100%
g solution
Remember! g solution = g solute + g solvent
g/L =
g solute___
1 L solution
Remember! 1 L = 1000 mL and 1 mL = 0.001 L
(1) Household ammonia is a cleaning product that is a solution of
ammonia (NH3) and water (H2O). What is the percent concentration of
ammonia in a solution containing 20 g NH3 and 180 g H2O?
(2) Stronger ammonia solutions are used in the fermentation industry as
a source of nitrogen for microorganisms. What is the percent
concentration of ammonia in a solution containing 25 g NH3 and 75 g
H2O?
Molarity = M = mol solute__
1 Liter solution
(1) A 222 mL can of Coca-Cola contains 25 g of sugar. What is the
concentration of sugar expressed in g/L?
(2) A recipe for simple syrup calls for 200 g sugar to be dissolved into
250 mL of water. What is the concentration of sugar expressed in g/L?
ppm =
g solute__ _
1,000,000 g solution
(1) A sample of stomach acid (hydrochloric acid or HCl) contains 0.02
mol of HCl in 2.0 L water. What is the molarity of the solution?
Remember: 1 g = 1000 mg and 1 mg = 0.001 g and 1 kg = 1000 g
(1) A chemist analyzes a 500 g water sample and finds that it contains
1.0 mg of mercury. Convert this measurement to parts per million.
(2) Human blood has a hydroxide ion (OH-) concentration of about 2.0 x
10-7 M. How many moles of OH- are in a 3 L sample of blood?
(2) A chemist analyzes a 10 kg water sample and finds that it contains
10 mg of lead. Convert this measurement to parts per million.
Solutions Vocabulary Review Puzzle. Complete each statement below by choosing a term from the
word bank.
Concentration
moles
solute
solution
liter
parts per million
molarity
ratios
__________________ is the quantity of solute in a specific quantity of solvent or solution. One way
of expressing concentration is to use the unit of measure called _______________; it is the ratio of
_______________ amount (in moles) to ________________ volume (in liters), or simply
_____________ of solute per L of solution. We have learned how to calculate other concentration
units or _______________, such as ___________________ (ppm = g solute/ 1,000,000 g solution).
solution
solvent
nonpolar
solute
homogeneous
polar
solubility
aqueous
maximum
All parts of a ______________________ mixture have the same composition. Another
name for this type of mixture is a __________________. A true solution is formed when a solute, as
molecules or ions, is dispersed throughout a __________________ to form a homogeneous mixture.
A solution in which the solvent is water is described as an ________________________ solution. An
example of this type of solution is salt water, in which salt is the _____________ and water is the
solvent.
The ______________________ of a solute is defined as the ___________________
amount of that solute that will dissolve in a given amount of a solvent under specified conditions.
Generally, ______________ solutes will dissolve in nonpolar solvents and _____________ solutes
will dissolve in polar solvents. This rule known as the “like dissolves like” rule.