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vladimir1956 [14]
2 years ago
10

What is the pH of 40.0 mL of a solution that is 0.15 M in CN� and 0.29 M in HCN? For HCN, use Ka = 4.9 * 10^-9

Chemistry
1 answer:
artcher [175]2 years ago
4 0
This is a buffer solution because it consists of a weak acid (HCN) and its conjugate base (CN-)
Since it's a buffer solution, the pH is equal to the pKa of the solution, you would use the henderson-hasslebach equation:
pH = pKa - log([acid]/[base])
pH = -log(4.9*10-9) - log(.29/.15)
pH = about 8
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The mass of pentane the student should weigh out is

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mass of pentane = 0.626 gcm-3 * 45.0 mL

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However the unit of density is gcm-3 and unit of volume is mL i.e. cm3

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brainly.com/question/1354972

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