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Brut [27]
3 years ago
15

Which of the following best defines a scientific law?

Chemistry
2 answers:
Nina [5.8K]3 years ago
8 0
D. hope this helps buddy
Lemur [1.5K]3 years ago
5 0

Answer:

d i think hope that helps

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A buffer solution is made using a weak acid, HA. If the pH of the buffer is 9 and the ratio of A– to HA is 100, what is the pKa
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To calculate the pKa of the weak acid, we use the Henderson-Hasselbalch equation. It is expressed as pH = pKa - log [HA]/[A-]. This equation takes into account the concentration of the substance that does not dissociates into ions since it is a weak acid. We caculate as follows:

pH = pKa - log [HA]/[A-]
9 = pKa - log 1/100
pKa = 7
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