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Calculating the pH of Strong Monobasic Acids
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Created by
Ellie Murray
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Cards (9)
What is a characteristic of a monobasic acid?
A monobasic acid donates ONE
H⁺
ion per molecule of acid.
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What does it mean for a strong acid to dissociate completely?
It means that the acid breaks down entirely into its
ions
in solution.
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Give two examples of strong monobasic acids.
HCl
(
hydrochloric acid
) and
HNO₃
(
nitric acid
).
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How do you calculate the pH of strong monobasic acids?
Use the formula:
pH
=
\text{pH} =
pH
=
−
log
[
H
+
]
-\log[H^+]
−
lo
g
[
H
+
]
[H⁺]
is the concentration of the acid in
moldm⁻³
.
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What happens to the pH as the concentration of a strong monobasic acid increases?
The
higher
the concentration, the
lower
the pH.
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What is the formula to calculate pH from hydrogen ion concentration?
pH = -
log[H⁺]
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What is the pH of a 0.500 moldm⁻³ HCl solution?
The pH is
0.3
.
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Calculate the pH of the following strong monobasic acid solutions (to 1 d.p.):
0.600 moldm⁻³ HCl
0.800 moldm⁻³ HNO₃
0.440 moldm⁻³ HClO₄
pH = -
log
(0.600) ≈ 0.2
pH = -log(0.800) ≈ 0.1
pH = -log(0.440) ≈ 0.4
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What is the significance of the button on your calculator mentioned in the study material?
It is used to find the
logarithm
of the
hydrogen ion concentration
.
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