What is the mole ratio of ammonia (with a pKb of 4.75) to ammonium chloride in a buffer with a pH of 9.09

0.692

Explanation:

To solve this problem we can use Henderson-Hasselbach's (H-H) equation:

In which pOH can be calculated from the pH:

Then we use the H-H equation to calculate:

As the problem asks for the ratio of ammonia to ammonium chloride, we invert :

1 a

2 d

3 a

4 c

explanation:

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.