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 0.0150 mol of NaOH. For 230.0 mL of a buffer solution that is 0.2763 M in CH3CH2NH2 and 0.2518 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.0150 mol of NaOH(Kb=5.6⋅10−4).

Solutions

Expert Solution

Since this is a buffer solution, we can use the Henderson Hasselbalch eqn. to calculate the pH
pKa = 10.636 for CH3CH2NH3Cl
pH = pKa + log([CH3CH2NH2] / [CH3CH2NH3Cl]) = 10.636 + log(0.2763/0.2518) = 10.676

Final pH:
moles CH3CH2NH2 = 0.230 L x 0.2763 M = 0.06355
moles CH3CH2NH3Cl = 0.230 L x 0.2518 M = 0.0579
CH3CH2NH3+ + OH- = CH3CH2NH2 + H2O
moles CH3CH2NH3+ = 0.0579 - 0.015 = 0.043
moles CH3CH2NH2 = 0.06355 + 0.015 = 0.07855
Can use the Henderson Hasselbalch eqn. since this is still a healthy buffer (still decent amount of base and acid present).
[CH3CH2NH3+] = 0.043/ 0.230 = 0.187 M
[CH3CH2NH2] = 0.07855/0.230 L = 0.3415 M
pH = 10.636 + log(.3415 / 0.187) = 10.897

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

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 0.005 mol of NaOH. Separate your answers using a comma. Part A: For 260.0 mL of pure water, calculate the initial pH and the final pH after adding 0.005 mol of NaOH. Part B: For 260.0 mL of a buffer solution that is 0.245 M in HCHO2 and 0.275 M in KCHO2, calculate the initial pH and the final pHafter adding 0.005 mol of...

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 290.0 mL of a buffer solution that is 0.210 M in HCHO2 and 0.290 M in KCHO2 290.0 mL of a buffer solution that is 0.295 M in CH3CH2NH2 and 0.265 M in CH3CH2NH3Cl

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 0.005 mol of NaOH. 210.0 mL of a buffer solution that is 0.315 M in CH3CH2NH2 and 0.285 M in CH3CH2NH3Cl Express your answers using two decimal places separated by a comma.

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 0.0200 mol of NaOH. Part A For 220.0 mL of a buffer solution that is 0.235 M in HCHO 2 and 0.290 M in KCHO 2 , calculate the initial pH and the final pH after adding 0.0200 mol of NaOH( K a =1.8⋅ 10 −4 ) . Part B For 220.0 mL of a buffer solution that is 0.2710 M in CH 3...

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. Part A For 230.0 mL of pure water, 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. pHinitial, pHfinal = Part B For 230.0 mL of a buffer solution that is 0.245 M in HCHO2 and 0.290 M in KCHO2, calculate the initial pH...

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 0.005 mol of NaOH. A.280.0 mL of pure water initial pH, final pH B.280.0 mL of a buffer solution that is 0.245 M in HCHO2 and 0.280 M in KCHO2 initial pH, final pH C.280.0 mL of a buffer solution that is 0.320 M in CH3CH2NH2 and 0.300 M in CH3CH2NH3Cl initial pH, final pH

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 0.005 mol of NaOH290.0 mL of a buffer solution that is 0.315 molL−1 in C2H5NH2 and 0.295 molL−1molL−1 in C2H5NH3Cl

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. a) For 230.0 mL of a buffer solution that is 0.205 M in HCHO2 and 0.275 M in KCHO2, calculate the initial pH and the final pH after adding 0.010 mol of NaOH. b) For 230.0 mL of a buffer solution that is 0.320 M in CH3CH2NH2 and 0.290 M in CH3CH2NH3Cl, calculate the initial pH and the final pH...

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 0.005 mol of NaOH. 270.0 mL of pure water pHinitial, pHfinal 270.0 mL of a buffer solution that is 0.200 M in HCHO2 and 0.315 M in KCHO2 pHinitial, pHfinal 270.0 mL of a buffer solution that is 0.325 M in CH3CH2NH2 and 0.305 M in CH3CH2NH3Cl pHinitial, pHfinal

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. 1. For 240.0 mL of pure water, calculate the initial pH and the final pH after adding 0.010 mol of NaOH. 2. For 240.0 mL of a buffer solution that is 0.195M in HCOOH and 0.280 M in HCOOK, calculate the initial pH and the final pH after adding 0.010 mol of NaOH. 3. For 240.0 mL of a buffer...

Subjects