Question

1.) A 1.00 L solution contains 18.52  g of nitrous acid, HNO₂.What mass of sodium nitrite, NaNO₂, should be added to it to make a buffer with a pH of 2.76? K_a (HNO₂) = 4.0 × 10^–4.

2.) Calculate the change in pH when 0.310 mol H⁺ is added to 1.00 L of each of the following buffers.

a) a 0.580 M solution of pyridine (py) containing 0.480 M pyH^{+ (CHANGE IN PH?)}

^b)a 0.600 M solution of aniline (an) containing 0.920 M anH^{+ (CHANGE IN PH?)}