Question

For each of the following solutions, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH.

Part A

For 290.0 mL of pure water, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH.

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

Answer: pHinitial, pHfinal = 7.00,12.84

Part B

For 290.0 mL of a buffer solution that is 0.200 M in HCHO2 and 0.310 M in KCHO2, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH(Ka=1.8⋠10−4).

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

Answer: pHinitial, pHfinal = 3.94,4.21

Part C

For 290.0 mL of a buffer solution that is 0.2975 M in CH3CH2NH2 and 0.2675 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH(Kb=5.6⋠10−4).

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

I CAN'T FIGURE THIS ONE OUT!