melody12chocolatemil
18.01.2021 •
Chemistry
Calculate the pH of a buffer solution prepared by mixing 50.0 mL of 1.00 M lactic acid and 40.0 mL of 0.50 M sodium lactate. (The pKa for lactic acid is 3.86. The molar mass for lactic acid is 90.1 g/mol and the molar mass for sodium lactate is 112.1 g/mol.
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Ответ:
pH of the buffer is 4,26
Explanation:
The mixture of a weak acid as lactic acid with its conjugate base (Lactate ion), produce a buffer that follows the Henderson-Hasselbalch equation:
pH = pKa + log [A⁻] / [HA]
Where pKa is pKa of lactic acid: 3.86
And [] could be taken as moles of A⁻, sodium lactate and HA lactic acid.
Moles Lactate:
0.050L * (1.00mol /L) = 0.0500moles
Moles lactic acid:
0.040L * (0.50mol / L) = 0.0200 moles
Replacing in H-H equation:
pH = 3.86 + log [0.0500] / [0.0200]
pH = 4.26
pH of the buffer is 4,26Ответ:
The answer is B
B = Petri dishes and sterile droppers
Explanation: