Determine the pressure

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

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 is the percent by mass of oxygen in fe2o3