How many grams of solid potassium acetate should be added to 1.50 L of a 8.83×10² M acetic acid solution to prepare a buffer with a pH of 3.888 ? grams potassium acetate = g.

How many moles of potassium hydroxide would have to be added to 125 mL of a 0.438 M hydrocyanic acid solution, in order to prepare a buffer with a pH of 9.090? moles

A chemistry graduate student is given 125. mL of a 1.30M dimethylamine ((CH,) NH solution. Dimethylamine is a weak base with K,=5.4 × 10 . What mass of (CH,), NH, Cl should the student dissolve in the (CH,) NH solution to turn it into a buffer with pH =10.80? You may assume that the volume of the solution doesn't change when the (CH, NH, Cl is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. 10

A buffer solution contains 0.388 M ammonium bromide and 0.290 M ammonia. If 0.0311 moles of sodium hydroxide are added to 225 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume change does not change upon adding sodium hydroxide) pH