How many grams of solid sodium nitrite should be added to 1.00 L of a 0.227 M nitrous acid solution to prepare a buffer with a pH of 4.091 ? grams sodium nitrite = g.

How many grams of solid ammonium chloride should be added to 2.00 L of a 7.26×10-2 M ammonia solution to prepare a buffer with a pH of 8.710 ? grams ammonium chloride =            g

How many grams of solid potassium acetate should be added to 1.50 L of a 0.151 M acetic acid solution to prepare a buffer with a pH of 5.734 ? grams potassium acetate = g.

A buffer solution contains 0.207 M CH3NH3Cl and 0.499 M CH3NH2 (methylamine). Determine the pH change when 0.101 mol HNO3 is added to 1.00 L of the buffer.

A chemistry graduate student is given 450. mL of a 1.70M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with K,= 4.9 × 10 ". What mass of KCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 8.97? You may assume that the volume of the solution doesn't change when the KCN is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

A chemistry graduate student is given 300. mL of a 0.80 M methylamine (CH,NH,) solution. Methylamine is a weak base with K, = 4.4 x 10 . what mass of CH,NH,Cl should the student dissolve in the CH,NH, solution to turn it into a buffer with pH = 10.92? 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. Continue

A chemistry graduate student is given 300. mL of a 1.60M pyridine (C H,N) solution. Pyridine is a weak base with K,=1.7 × 10 What mass of CH,NHC1 should the student dissolve in the CH,N solution to turn it into a buffer with pH = 5.16? You may assume that the volume of the solution doesn't change when the CH,NHCI is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

Calculate the pH of a buffer when 0.010 moles of NaOH is added to 100. mL solution that is 0.20 M sodium pentanoate (C HCOONa) and 0.20 M pentanoic acid (CH₂COOH). PK (CH₂ a COOH) = 4.82.

How many grams of solid ammonium chloride should be added to 2.00 L of a 0.203 M ammonia solution to prepare a buffer with a pH of 8.480 ? grams ammonium chloride =  g.

A chemistry graduate student is given 250. mL of a 1.80 M dimethylamine ((CH3), NH) solution. Dimethylamine is a 2 -4 weak base with K = 5.4 × 10 What mass of (CH, NH,Br should the student dissolve in the (CH,) NH solution to 2 turn it into a buffer with pH = 11.26? You may assume that the volume of the solution doesn't change when the (CH,) NH,Br is dissolved in it. Be sure your 2 answer has a unit symbol, and round it to 2 significant digits.