A) How many grams of Sodium fluoride (NaF) should be added to 612 ml solution of 0.4 M Hydrofluoric acid (HF) to produce a buffer solution with pH = 3.10 (dissociation constant Ka = 6.8 x 10-4) (RAM Na=23, F=19) B) Using the following equations, explain the statement "Water is amphoteric" i) HCI + H20 –→ H3O* + CI ii) NH3 + H20 → NH4* + OH

Chemistry: An Atoms First Approach
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Author:Steven S. Zumdahl, Susan A. Zumdahl
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Chapter14: Acid- Base Equilibria
Section: Chapter Questions
Problem 4RQ: A good buffer generally contains relatively equal concentrations of weak acid and conjugate base. If...
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Q23
A) How many grams of Sodium
fluoride (NaF) should be added to
612 ml solution of 0.4 M Hydrofluoric
acid (HF) to produce a buffer
solution with pH = 3.10
(dissociation constant Ka =
10-4) (RAM Na=23, F=19)
6.8 x
B) Using the following equations,
explain the statement "Water is
amphoteric"
i) HCI + H20 –→ H3O* + CI-
ii) NH3 + H20 → NH4* + OH
Transcribed Image Text:A) How many grams of Sodium fluoride (NaF) should be added to 612 ml solution of 0.4 M Hydrofluoric acid (HF) to produce a buffer solution with pH = 3.10 (dissociation constant Ka = 10-4) (RAM Na=23, F=19) 6.8 x B) Using the following equations, explain the statement "Water is amphoteric" i) HCI + H20 –→ H3O* + CI- ii) NH3 + H20 → NH4* + OH
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