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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 87 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
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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CORALGRILL2014

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Reply 2 on: Feb 15, 2020
YES! Correct, THANKS for helping me on my review

momolu

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Reply 3 on: Yesterday
Excellent

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