Acids and Bases
What is the pH of an aqueous solution of C6H12O6?
7
Which substance is an electrolyte
H2SO4
Which compounds are electrolytes?
H3PO4 and Ca(OH)2
Which aqueous solution would turn blue litmus red?
HCl(aq)
Which pair of compounds represents one Arrhenius acid and one Arrhenius base?
HNO3 and NaOH
Why is potassium nitrate classified as an electrolyte?
It releases ions in an aqueous solution.
Which substance is an electrolyte?
KNO3
Which substance is an Arrhenius base?
KOH
Which two compounds are electrolytes?
KOH and CH3COOH
Which of the following is the best conductor of electricity?
NaCl(aq)
Which of these 1 M solutions will have the highest pH?
NaOH
How are HNO3 (aq) and CH3COOH (aq) similar?
They are Arrhenius acids and they turn blue litmus red.
If an aqueous solution turns blue litmus red which relationship exists between the hydronium ion and hydroxide ion concentrations?
[H3O+] > [OH-]
Based on the results of testing colorless solutions with indicators, which solution is most acidic?
a solution in which phenolphthalein is pink
Which change in the H+ ion concentration of an aqueous solution represents a decrease of one unit on the pH scale?
a tenfold increase
When the pH of an aqueous solution is changed from 1 to 2, the concentration of hydronium ions in the solution is
decreased by a factor of 10
As an aqueous solution becomes more acidic, the hydroxide ion concentration
decreases
The only positive ion found in H2SO4(aq) is the
hydronium ion
When dissolved in water, an Arrhenius base yields
hydroxide ions
The compound NaOH(s) dissolves in water to yield
hydroxide ions as the only negative ions
The pH of an aqueous solution changes from 4 to 3 when the hydrogen ion concentration in the solution is
increased by a factor of 10
When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution
increases by 1
The electrical conductivity of an aqueous solution depends on the concentration of which particles in the solution?
ions
Which of the following pH values indicates the highest concentration of hydronium ions in a solution?
pH = 1
The pH of a solution is 1. The hydrogen ion concentration of this solution, in moles per liter, is
0.1
Which of the following 0.1 M solutions has the lowest pH?
0.1 M HCl
In an acid solution, the [H+] ion is found to be 1 × 10-2 mole per liter. What is the [OH-] ion in moles per liter?
1 × 10^-12
What is the OH- ion concentration, in moles per liter, of a solution with a pH of 7?
1 × 10^-7
A solution has a hydroxide ion concentration of 1 × 10^-5 M. What is the hydrogen ion concentration of the solution?
1 × 10^-9 M
What is the H+ ion concentration of an aqueous solution that has a pH of 11?
1.0 × 10^-11 mol/L
What is the pH of a 0.001 M KOH solution?
11
Phenolphthalein is pink in an aqueous solution having a pH of
12
Which sample of HCI(aq) contains the greatest number of moles of solute particles?
2.0 L of 2.0 M HCI(aq)
Which equation represent neutralization
2KOH(aq) + H2SO4(aq) --> K2SO4(aq) = 2H2O(l)
A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of
3.0
Compared to a solution with a pH value of 7, a solution with a thousand times greater hydronium ion concentration has a pH value of
4
The pH of a solution is 7. When acid is added to the solution, the hydronium ion concentration becomes 100 times greater. What is the pH of the new solution?
5
What is the pH of a 0.00001 molar HCl solution?
5
An aqueous solution that has a hydrogen ion concentration of 1.0 × 10^-8 mole per liter has a pH of
8, which is basic
Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue if the pH of the solution is
9.9
Which substance yields H+(aq) as the only positive ion in an aqueous solution?
CH3COOH
In which 0.01 M solution is phenolphthalein pink?
Ca(OH)2(aq)
Potassium hydroxide is classified as an Arrhenius base because KOH contains
OH- ions
Which statement describes an electrolyte?
When an electrolyte dissolves in water, the resulting solution conducts an electric current.
Which relationship is present in a solution that has a pH of 7?
[H+] = [OH-]
When one compound dissolves in water, the only positive ion produced in the solution is H3O+ (aq). This compound is identified as
an Arrhenius acid
Which type of substance yields hydrogen ions, H+ , in an aqueous solution?
an Arrhenius acid
Which type of substance yields hydrogen ions, H+, in an aqueous solution?
an Arrhenius acid
A student records the following observations about an unknown solution: • conducts electricity • turns blue litmus red The student should conclude that the unknown solution is most likely
an acid
What is the color of the indicator thymol blue in a solution that has a pH of 11?
blue
Which indicator is blue in a solution that has a pH of 5.6?
bromcresol green
According to the Arrhenius theory, a base reacts with an acid to produce
water and a salt
