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ndkdidnfnk
15.07.2020 •
Chemistry
What molar ratio of sodium acetate to acetic acid should be used to prepare a buffer with pH = 4.5? Ka acetic acid = 1.8 x 10-5.
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Ответ:
molar ratio: 0.58
Explanation:
This is a buffer problem. We would use the equation
. Since we were given Ka and pH, we can find the ratio.
pKa=-log(Ka)
pKa=-log(1.8×10⁻⁵)
pKa=4.74
Now that we have pKa, we can plug in our values and find the molar ratio. Instead of writing base/acid, let's use x.
4.5=4.74+log(x)
-0.24=log(x)
10⁻⁰⁻²⁴=x
x=0.58
Ответ:
The sun's corona can be seen during a solar eclipse.