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WorksheetspH and pOH
Total questions: 27
Worksheet time: 14mins
pH balance is related to the equilibrium state of what kind of reaction?
a precipitation reaction
a combustion reaction
a reversible reaction
an allergic reaction
Which Danish chemist came up with the term "pH", but never explained his reasoning?
Niels Bohr
Hans Christian Ørsted
Hans Christian Andersen
Søren Sørensen
Which subatomic particle is pivotal to the behavior of acids and bases?
the electron
the proton
the neutron
the neutrino
You can think of pH as basically the power of ___
hydrogen in a solution
hydroxide in a mixture
helium in an alloy
heavy water
Water can function as an acid and as a base, by releasing and consuming ___
alpha particles
hydronium ions
photons
hydrogen ions
pH is mathematically defined as the "negative of the base ten logarithm of the ___"
molar mass of protons
concentration of hydrogen ions in solution
mass of hydrogen ions in solution
molarity of helium ions
If a solution has a concentration of hydrogen ions of 1 x 10-5 mol/L, what is the pH of the solution?
-5
1
5
10
What is the base ten logarithm of one hundred?
1
2
10
200
If your calculator has a 'log' button, that's just for ___
natural logarithms
binary calculations
hexadecimal calculations
base ten logs
When a hydrogen ion, or proton, attaches to a water molecule it forms ___
a hydronium ion, H3O+
a hydroxide ion, OH-
a hydronium ion, OH-
a hydroxide ion, H3O+
When a water molecule loses a hydrogen ion, or proton, it becomes ___
a hydronium ion, H3O+
a hydroxide ion, OH-
a hydronium ion, OH-
a hydroxide ion, H3O+
For simplification, you'll sometimes see the hydronium ion written as __
a hydrogen ion, H+
a hydroxide ion, OH-
heavy water, D2O
a water molecule, H2O
When we say that the pH is the negative log of the hydrogen ion concentration, we actually mean ___
natural logarithms
hydrogen ion mass
hydroxide ion density
hydronium ion concentration
At any given instant only a tiny number of water molecules are ___
actually H2O
dissociated into ions
polar
attracted to each other
What symbol is used for the water dissociation constant?
Cw
Wc
Kw
Wk
What is the numerical value of Kw, the water dissociation constant?
14.0 x 10-1
7.0 x 10-2
2.0 x 10-7
1.0 x 10-14
Water is neutral, so the center of the pH scale is ___
1
7
10
14
Litmus paper turns pinkish red when exposed to ___
air
an acid
a base
distilled water
What color does litmus paper turn when exposed to a base?
pink
blue
purple
beige
When the hydrogen ion concentration goes up, the pH ___
gets lower
stays the same
gets higher
goes toward 7
If the hydrogen ion concentration is 1.0 x 10-11, a thousandth of the value for pure water, the pH would be ___
1.0
7
10
11
The pH scale is normally written from ___
0 to 7
7 to 14
1 to 10
0 to 14
Strong acids, like hydrochloric acid, raise the hydrogen ion concentration a lot, and generally have ___
very low pHs
pHs in the 4 to 6 range
pHs in the 8 to 11 range
very high pHs
Weak acids, like citric acid, dissociate incompletely and generally have ___
very low pHs
pHs in the 4 to 6 range
pHs in the 8 to 11 range
very high pHs
Strong bases, like sodium hydroxide, consume large amounts of hydrogen ions, so they tend to have ___
very low pHs
pHs in the 4 to 6 range
pHs in the 8 to 11 range
very high pHs
Weak bases, like sodium bicarbonate (baking soda), generally have ___
very low pHs
pHs in the 4 to 6 range
pHs in the 8 to 11 range
very high pHs
The sum of the pH and the pOH is always ___
1
7
10
14
