Air is made up of mostly O2, N2 and CO2. if the total pressure of the air is 765 mmhg and P(n2)= 600 mmHg and P(CO2)=38 mmHg then what is the partial pressure of the O2 ?

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present