Part A A lactic acid/actate ion buffer solution contains 0.32 MHC3H5O3 and 0.67 MC3H5O3, respectively. The K, value of lactic acid is 1.4 x 10-4. Calculate the pH of this buffer. Express the pH numerically. ▸ View Available Hint(s) pH = Submit 197) ΑΣΦ ?
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<Ch. 10: pH, Titrations and Buffers - Attempt 1
Calculating the pH of an Acid Buffer
Ka
A buffer consists of a weak acid or base, and the
salt of that acid or base.
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Consider a buffer made by combining the weak
acid HA with its salt, A¯:
HA(aq) + H₂O(1) ≈ A¯(aq) + H3O+ (aq)
[A][H3O+]
[HA]
The H3O+ concentration of this buffer can be
calculated using the Ka expression:
=
K₂ [HA]
[A]
You can use this expression when solving for pH,
or you can simplify the expression even more.
Taking the negative log of this expression, you have
[HA]
-log[H3O+] = -log[K₂] – log [A
Since -log[H3O+] = pH and
-log[Ka] =pKa, this can be further simplified to
[A]
pH = pK₂ + log HA
[HA]
[H3O+] =
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Part A
Express the pH numerically.
► View Available Hint(s)
pH =
Submit
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Mastering Chemistry Assign X
17 ΑΣΦ
MasteringChemistry: Ch. 10 X
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A lactic acid/lactate ion buffer solution contains 0.32 MHC3 H5O3 and 0.67 MC3H5O3¯, respectively. The Ką value of lactic acid is 1.4 × 10-4. Calculate the pH of
this buffer.
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