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Author Question: What is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in ... (Read 49 times)

CORALGRILL2014

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on: Feb 15, 2020

Question 1

Which statement about buffers is true?
◦ A buffer does not change pH on addition of a strong acid or strong base.
◦ Buffers have a pH = 7.
◦ Buffers consist of a strong acid and its conjugate base.
◦ Buffers resist change in pH upon addition of small amounts of strong acid or strong base.

Question 2

What is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give a volume of 200.0 mL? The Ka2 for dihydrogen phosphate is 6.2 × 10-8 and the equilibrium reaction of interest is

H2PO4-(aq) + H2O(l) ⇌ H3O+(aq) + HPO4-(aq).


◦ 7.38
◦ 7.03
◦ 7.17
◦ 7.58
Chemistry ¦ McMurry, Fay, Robinson ¦ 7th Edition
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Marked as best answer by CORALGRILL2014 on Feb 15, 2020

peilian

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Reply #1 on: Feb 15, 2020
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CORALGRILL2014

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Reply 2 on: Feb 15, 2020
Wow, this really help

Missbam101

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Reply 3 on: Yesterday
Excellent

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