For each of the following solutions, calculate the initial pH and the final pH after adding...

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For each of the following solutions, calculate the initial pH and the final pH after adding...

For each of the following solutions, calculate the initial pH and the final pH after adding 0.010 mol of NaOH.

12A. For 280.0 mL of a buffer solution that is 0.205 M in HCHO2 and 0.315 M in KCHO2, calculate the initial pH and the final pH after adding 0.010 mol of NaOH.

12B. For 280.0 mL of a buffer solution that is 0.325 M in CH3CH2NH2 and 0.295 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.010 mol of NaOH.

Express your answers using two decimal places separated by a comma.

science chemistry

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Answer 1

Answer #1

Note : i took Ka values from sapling . please check once whether these are match with your values or not. if any wrong that is only with Ka values. so please check before doing

12A. )

pH = pKa + log [salt / acid]

= 3.74 + log [0.315 / 0.205]

initial pH = 3.93

when 0.010 mol NaOH is added :

pH = pKa + log [salt + C / acid - C]

= 3.74 + log [0.315 + 0.01 / 0.205 - 0.01]

final pH = 3.96

12B.)

pH = pKa + log [base / acid]

= 10.80 + log [0.325 / 0.295]

initial pH = 10.84

when NaOH is added :

pH = pKa + log [base + C / acid - C]

= 10.80 + log [0.325 + 0.01 / 0.295 - 0.01]

final pH = 10.87

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Answer 2

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