A 15.0 atm pressurized 5.00 L cylinder refriegerated at 9.89°C is filled with an air mixture containing 30% helium, 30% diatomic nitrogen, and 40% nitrogen dioxide by volume. What is the partial pressure of each component and how many grams of each component are contained in the cylinder?

Explanation is in the answer

Explanation:

The pH of the buffer solution does not change appreciably because the strong acid (free H⁺) reacts with conjugate base of buffer producing more weak acid. pH formula of buffers is (Henderson-Hasselbalch formula):

pH = pKa + log ( [A⁻] / [HA] )

The addition of strong acid decreases [A⁻] increasing [HA]. pH change just in the log of the ratio of [A⁻] with [HA], that is a real little effect over pH of the buffer solution.