pH — Quiz Answers

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1
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What is the equilibrium constant of pure water at 25 times degree C ?

A
10 to the 14th power
B
10 to the 7th power
C
10 to the negative 14 power
D
10 to the negative 7 power
2
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Which statement about the self-ionization of water is correct?

A
Two water molecules interact to form a hydronium ion and a hydroxide ion.
B
Two water molecules interact to form two hydronium ions.
C
Two water molecules interact to form two hydroxide ions.
D
Two water molecules interact to form a water molecule and a hydroxide ion.
3

The pOH of a solution is 10 point 7 5 What is the concentration of OH raised to the negative power ions in the solution? Use open bracket OH raised to the negative power close bracket is equal to 10 raised to the negative pOH power

A
1 point 0 7 5 times 10 squared cap m
B
5 point 6 2 3 times 10 to the 10th power cap m
C
1 point 7 7 8 times 10 to the negative 11 power cap m
D
3 point 1 6 2 times 10 to the negative 108 power cap m
4

The pH of a solution decreases by 2 point 0 How does the hydronium ion concentration of the solution change?

A
decreases to 1 half of the original concentration
B
decreases to 1 over 100 of the original concentration
C
increases to 2 times the original concentration
D
increases to 100 times the original concentration
5

A solution containing HCl would likely have

A
a low pH and a high pOH .
B
a high pH and a low pOH .
C
a high pH and a high pOH .
D
a low pH and a low pOH .
6

Which describes an alkaline solution?

A
pH equal to 7
B
pH less than 7
C
acidic
D
basic
7

A substance with a high pOH would likely have which of these?

A
A low open bracket cap h raised to the plus power close bracket and a high pH
B
A low open bracket OH raised to the negative power close bracket and a high pH
C
A high open bracket cap h raised to the plus power close bracket and a low pH
D
A high open bracket OH raised to the negative power close bracket and a low pH
9

Based on the definition of logarithms, what is the difference in hydrogen ion concentration between a substance with a pH of 2 and a substance with a pH of 3 ?

A
A substance with a pH of 2 has a 10 times higher concentration of cap h raised to the plus power than a substance with a pH of 3 .
B
A substance with a pH of 3 has a 10 times higher concentration of cap h raised to the plus power than a substance with a pH of 2 .
C
A substance with a pH of 3 has a 100 times higher concentration of cap h raised to the plus power ions than a substance with a pH of 2 .
D
A substance with a pH of 2 has a 100 times higher concentration of cap h raised to the plus power ions than a substance with a pH of 3 .
10

Which of these correctly defines the pH of a solution?

A
the log of the hydronium ion concentration
B
the negative log of the hydronium ion concentration
C
the negative log of the hydroxide ion concentration
D
the log of the hydroxide ion concentration

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