1. A buffer solution contains 0.256 M hydrofluoric acid and 0.308 M potassium fluoride. If 0.0414...
1. A buffer solution contains 0.256 M
hydrofluoric acid and 0.308 M
potassium fluoride.
If 0.0414 moles of hydrochloric
acid are added to 225 mL of this buffer,
what is the pH of the resulting solution ?
(Assume that the volume does not change upon adding
hydrochloric acid)
pH =
2. A buffer solution contains 0.328 M
ammonium chloride and
0.331 M ammonia.
If 0.0396 moles of sodium
hydroxide are added to 225 mL of this
buffer, what is the pH of the resulting solution ?
(Assume that the volume does not change upon adding sodium
hydroxide)
pH =
Homework Answers
![concentration of hydrofluoric acid (HF), [HF] = 0.256 M Concentration of potassium fluoride(KF), KF-0.308 M Volume of the buffer solution is 225 mlL Calculate the moles of HF as follows: molarity× volume 1L 1000 mL = 0.0576 mol Calculate the moles of KF as follows: molarityx volume 1L 1000 mL 0.308 mol L-1 × 225 mL × = 0.0693 mol Moles of hydrochloric acid (HCl) added is 0.0414 mol. After the addition of HCl, Moles of HF is given by, (0.0576+0.0414)mol = 0.0990 mol](http://img.homeworklib.com/questions/9b5e0f40-d22a-11ea-a900-81b0a2221c24.png?x-oss-process=image/resize,w_560)
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1. A buffer solution contains 0.256 M
hydrofluoric acid and 0.308 M
potassium fluoride.
If 0.0414...
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