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Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 1.17 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) What is the pH of this buffer?
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Answers ( )
Answer:
pH = 1.62
Explanation:
We can solve this problem using Henderson-Hasselbach’s equation:
Where
Now we convert 132.8 g of NaC₇H₅O₂ into moles, using its molar mass:
Then we calculate [NaC₇H₅O₂]:
Now we can proceed to calculate the pH of the solution: