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pH and pOH

Total questions: 27

Worksheet time: 14mins

Name
Class
Date
1.

pH balance is related to the equilibrium state of what kind of reaction?

a)

a precipitation reaction

b)

a combustion reaction

c)

a reversible reaction

d)

an allergic reaction

2.

Which Danish chemist came up with the term "pH", but never explained his reasoning?

a)

Niels Bohr

b)

Hans Christian Ørsted

c)

Hans Christian Andersen

d)

Søren Sørensen

3.

Which subatomic particle is pivotal to the behavior of acids and bases?

a)

the electron

b)

the proton

c)

the neutron

d)

the neutrino

4.

You can think of pH as basically the power of ___

a)

hydrogen in a solution

b)

hydroxide in a mixture

c)

helium in an alloy

d)

heavy water

5.

Water can function as an acid and as a base, by releasing and consuming ___

a)

alpha particles

b)

hydronium ions

c)

photons

d)

hydrogen ions

6.

pH is mathematically defined as the "negative of the base ten logarithm of the ___"

a)

molar mass of protons

b)

concentration of hydrogen ions in solution

c)

mass of hydrogen ions in solution

d)

molarity of helium ions

7.

If a solution has a concentration of hydrogen ions of 1 x 10-5 mol/L, what is the pH of the solution?

a)

-5

b)

1

c)

5

d)

10

8.

What is the base ten logarithm of one hundred?

a)

1

b)

2

c)

10

d)

200

9.

If your calculator has a 'log' button, that's just for ___

a)

natural logarithms

b)

binary calculations

c)

hexadecimal calculations

d)

base ten logs

10.

When a hydrogen ion, or proton, attaches to a water molecule it forms ___

a)

a hydronium ion, H3O+

b)

a hydroxide ion, OH-

c)

a hydronium ion, OH-

d)

a hydroxide ion, H3O+

11.

When a water molecule loses a hydrogen ion, or proton, it becomes ___

a)

a hydronium ion, H3O+

b)

a hydroxide ion, OH-

c)

a hydronium ion, OH-

d)

a hydroxide ion, H3O+

12.

For simplification, you'll sometimes see the hydronium ion written as __

a)

a hydrogen ion, H+

b)

a hydroxide ion, OH-

c)

heavy water, D2O

d)

a water molecule, H2O

13.

When we say that the pH is the negative log of the hydrogen ion concentration, we actually mean ___

a)

natural logarithms

b)

hydrogen ion mass

c)

hydroxide ion density

d)

hydronium ion concentration

14.

At any given instant only a tiny number of water molecules are ___

a)

actually H2O

b)

dissociated into ions

c)

polar

d)

attracted to each other

15.

What symbol is used for the water dissociation constant?

a)

Cw

b)

Wc

c)

Kw

d)

Wk

16.

What is the numerical value of Kw, the water dissociation constant?

a)

14.0 x 10-1

b)

7.0 x 10-2

c)

2.0 x 10-7

d)

1.0 x 10-14

17.

Water is neutral, so the center of the pH scale is ___

a)

1

b)

7

c)

10

d)

14

18.

Litmus paper turns pinkish red when exposed to ___

a)

air

b)

an acid

c)

a base

d)

distilled water

19.

What color does litmus paper turn when exposed to a base?

a)

pink

b)

blue

c)

purple

d)

beige

20.

When the hydrogen ion concentration goes up, the pH ___

a)

gets lower

b)

stays the same

c)

gets higher

d)

goes toward 7

21.

If the hydrogen ion concentration is 1.0 x 10-11, a thousandth of the value for pure water, the pH would be ___

a)

1.0

b)

7

c)

10

d)

11

22.

The pH scale is normally written from ___

a)

0 to 7

b)

7 to 14

c)

1 to 10

d)

0 to 14

23.

Strong acids, like hydrochloric acid, raise the hydrogen ion concentration a lot, and generally have ___

a)

very low pHs

b)

pHs in the 4 to 6 range

c)

pHs in the 8 to 11 range

d)

very high pHs

24.

Weak acids, like citric acid, dissociate incompletely and generally have ___

a)

very low pHs

b)

pHs in the 4 to 6 range

c)

pHs in the 8 to 11 range

d)

very high pHs

25.

Strong bases, like sodium hydroxide, consume large amounts of hydrogen ions, so they tend to have ___

a)

very low pHs

b)

pHs in the 4 to 6 range

c)

pHs in the 8 to 11 range

d)

very high pHs

26.

Weak bases, like sodium bicarbonate (baking soda), generally have ___

a)

very low pHs

b)

pHs in the 4 to 6 range

c)

pHs in the 8 to 11 range

d)

very high pHs

27.

The sum of the pH and the pOH is always ___

a)

1

b)

7

c)

10

d)

14