What kind of chemical reaction is shown? mg + 2 hcl mgcl2 + h2

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

What layer of the atmosphere is directly above the troposphere?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution