What is a mixture of hot gasses and volcanic material that moves at highspeeds

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

In which situation can a mixture always be called a solution