A buffer solution containing only 0.050 mol of CH3NH2 and 0.060 mol of CH3NH3CI has a total volume of 500 mL. What is the pH after the addition of 0.020 mol of solid NaOH to this buffer? Kb (CH3NH2) = 4.2 x 10-4 O 11.05 O 10.62 O 12.60 10.19

A buffer solution is 0.40 M in acetic acid and 0.38 M sodium acetate (Ka= 1.75X10-5). Calculate the change in pH upon adding 20.0 mL of 0.1 M HCl to 200 mL of this solution. 1. O0.04 2. O4.76 3. O-0.04 4. O-0.90

What is the pH of a buffer made by combining 181 mL of 0.34 MNaC₂H3O2 with 170 mL of 0.28 MHC₂H3O₂? The Ka of acetic acid is 1.75 × 10-5. 4.83 O 4.64 O 5.38 4.88 O 5.93

A chemistry graduate student is given 300. mL of a 0.50M dimethylamine ((CH3)2NH) solution. Dimethylamine is a weak base with K = 5.4 × 10 (CH3)2NH2Br should the student dissolve in the (CH3)2NH solution to turn it into a buffer with pH = 10.617 You may assume that the volume of the solution doesn't change when the (CH3)2NH2Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. ☐ x10