Unit 8 Chem Test
The pH scale allows scientists to define the acidity of a substance on a scale of _____. Selected:
0-14
What is the pH of 0.45 M of H2SO4?
0.045
What is the hydrogen ion concentration of 0.050 M H3PO4?
0.15 M
In the lab, a chemist adds 3.6 grams of sodium chloride to 100.0 g of water. What is the molality of the solution?
0.615
Calculate the hydrogen ion concentration of an aqueous solution, given the concentration of hydroxide ions is 1 x 10-5 M and the ion constant for water is 1 x 10-14.
1 ' 10^-9
Calculate the Hmc037-1.jpg concentration of an aqueous solution, given the concentration of OH- is 1 × 10-5M and the ion product constant for water, KW is 1 × 10-14.
1 ´ 10-9M
Determine the hydrogen ion concentration of 0.650 M aqueous solution of NaOH. The ionization product constant for water, KW, is 1.00 × 10-14.
1.54 ' 10^-14
An aqueous solution has a pH of 2.7 at 298 K. Calculate the pOH of the aqueous solution.
11
Calculate the hydrogen ion concentration of an aqueous solution, given the pOH of the solution is 4.50 and the ion product constant for water, KW, is 1.00 × 10-14.
3.16 ´ 10-10M
The hydrogen ion concentration of a fruit juice is 2.5 × 10-5M. What is the pH of the juice?
4.6
At 298 K, the Hmc020-1.jpg ion concentration of an aqueous solution is 1.00 × 10-5M. What is the pH of the solution?
5.00
What is the percent by volume of 15.0 mL of ethanol in 250 mL of water?
5.67
In the lab, a chemist adds 5.85 grams of sodium chloride to make 100.0 ml of a water solution . What is the molarity of the solution?
58.5
If you want to dissolve 91.6 g of KCl in 200 g of water, what temperature should the water be?
60 C
What is the pH of blood, given the hydrogen ion concentration is 4.0 x 10-8 M?
7.4
What volume, in milliliters, of 2.0 M calcium chloride stock solution would you use to make 500 m L of 0.300 M of calcium chloride CaCl2 solution?
75
Calculate pH of an aqueous solution of hydrogen chloride acid. Given the hydrogen ion concentration is 8.75 × 10-9M.
8.06
Calculate the pOH of a 0.410 M Ba(OH)2 solution.
8.62 × 10−2
Which model states that an acid is a substance that contains hydrogen and ionizes to produce hydrogen ions?
Arrhenius
Which is an example of a homogeneous mixture?
Clean air
A _____ is produced when a base accepts a hydrogen ion from an acid.
Conjugate acid
Which is the separation technique that relies on the different boiling points of the parts of the mixture?
Distillation
A colloid is a homogenous mixture of intermediate sized particles.
False
A conjugate acid is produced when an acid accepts a hydrogen ion.
False
A dilute solution contains large amounts of solute.
False
Acid solutions taste bitter and basic solutions taste sour.
False
An acid is an ion or molecule with a lone electron pair that it can donate or share.
False
An acidic solution contains more hydroxide ions than hydrogen ions.
False
An aqueous solution of acids causes red litmus paper to turn blue.
False
In a typical reaction, if the reacting acid is strong, the base produced is strong.
False
The Arrhenius model states that acids and bases share electron pairs.
False
Which is the type of separation technique being demonstrated in the figure?
Filtration
Identify the acid and conjugate base pair in the following equation: HF + NaOH <=>H2O + F- + Na +
HF and F-
When acids react with metals, they produce _____ gas.
Hydrogen
A basic solution contains more _____ ions than hydrogen.
Hydroxide
An acid that can donate only one hydrogen ion is called a _____ acid.
Monoprotic
Which substance can dissolve only 40 g in 60°C water?
NaCl
A solution that contains equal concentrations of hydrogen and hydroxide ions is _____.
Neutral
A _____ solution contains more dissolved solute than a saturated solution at the same temperature.
Supersaturated
A mixture containing particles that settle out if left undisturbed is a:
Suspension
The figure shows the results of paper chromatography of a mixture of pigments. Based on the results shown, which pigment has the greatest attraction for the paper?
The one furthest from the water
A single arrow in a reaction means that the reaction goes to completion.
True
Acids add flavor to many beverages and foods.
True
Acids and bases have the ability to conduct electricity.
True
In solution, strong acids and bases ionize completely, but weak acids and bases ionize only partially.
True
Milk is an example of a colloid.
True
Mixtures can be either heterogeneous or homogenous.
True
Muddy water from a creek after a heavy rain is an example of a suspension.
True
Substances that can act as both an acid and a base are said to be amphoteric.
True
The relative amounts of hydrogen and hydroxide ions determine whether an aqueous solution is acidic, basic or neutral.
True
Weak acids produce fewer ions than strong acids and cannot conduct electricity as well.
True
Illustrated is a phenomenon know as the:
Tyndall effect
In the Bronsted-Lowry model of acids and bases, an _____ is a hydrogen donor and a _____ is a hydrogen acceptor.
acid, base
