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For the reaction CH3COOH(aq) + H2O(l) <--> CH3COO-(aq) + H3O+(aq), what is the pH of a...

For the reaction CH3COOH(aq) + H2O(l) <--> CH3COO-(aq) + H3O+(aq), what is the pH of a solution that is 0.100M in CH3COOH and 0.200M in CH3COO-? What if the solution is 0.0100M in CH3COOH and 0.200M in CH3COO-?

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Answer #1

CH3COOH(aq) + H2O(l) <--------> CH3COO-(aq) + H3O+(aq)

pKa of acetic acid = 4.8

1) 0.100M in CH3COOH and 0.200M in CH3COO-

pH = pKa + log [CH3COO-]/[CH3COOH]

= 4.8 + log (0.2/0.1)

= 5.1

Therefore, pH of a solution that is 0.100M in CH3COOH and 0.200M in CH3COO- = 5.1

2) 0.0100M in CH3COOH and 0.200M in CH3COO-

pH = pKa + log [CH3COO-]/[CH3COOH]

= 4.8 + log (0.2/0.01)

= 6.1

Therefore, pH of a solution that is 0.0100M in CH3COOH and 0.200M in CH3COO- = 6.1

  

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