If you add 50 mL of 0.20 M NaOH to a 50 mL solution of 0.60 M HF, what is the pH of the resulting buffer
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Ответ:
pH = 2.87
Explanation:
When NaOH reacts with HF NaF and H2O are produced:
NaOH + HF → NaF + H2O
That means after the reaction moles of NaF are equal to moles of NaOH added and moles of HF are initial moles of HF - moles of NaOH added:
Moles NaOH = Moles NaF:
0.050L * (0.20mol/L) = 0.01 moles of NaF
Moles HF:
0.050L * (0.60mol/L) = 0.03 moles HF = Initial moles
0.03 moles - 0.01 moles = 0.02 moles HF
To find pH we need to use H-H equation to determine pH of the buffer:
pH = pKa + log [NaF] / [HF]
Where pH is pH of the buffer
pKa is pKa of HF-NaF buffer: 3.17
And [] could be taken as moles of each species.
That is:
pH = 3.17 + log [0.01] / [0.02]
pH = 2.87Ответ:
Explanation:
_HCI(aq) _
_H2O(1)
_ZnO(s)
_ZnCI2(aq)+_
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