How many milliliters of 1.07 M HCIO4 should be added to 1.90 g of imidazole to give a pH of 6.993? volume: mL

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Ka reaction: C₂H₂N₂H+ + H₂O=C3H₂N₂ + H₂0+
Calculate the pH of a solution prepared by mixing 1.90 g of imidazole with 1.90 g of imidazole hydrochloride and diluting to
100.0 mL. The pKa of imidazole hydrochloride is 6.993.
pH =
Calculate the pH of the solution if 2.40 mL of 1.07 M HClO are added.
4
pH =
7.18
volume:
7.08
How many milliliters of 1.07 M HClO4 should be added to 1.90 g of imidazole to give a pH of 6.993?
mL
Transcribed Image Text:Ka reaction: C₂H₂N₂H+ + H₂O=C3H₂N₂ + H₂0+ Calculate the pH of a solution prepared by mixing 1.90 g of imidazole with 1.90 g of imidazole hydrochloride and diluting to 100.0 mL. The pKa of imidazole hydrochloride is 6.993. pH = Calculate the pH of the solution if 2.40 mL of 1.07 M HClO are added. 4 pH = 7.18 volume: 7.08 How many milliliters of 1.07 M HClO4 should be added to 1.90 g of imidazole to give a pH of 6.993? mL
Expert Solution
Step 1

use

Henderson equation,

pOH = pKb + log [salt][base]

pH + pOH = 14pKa + pKb = 14

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