A buffer is made with 0.493 M of the weak base methylamine () with 0.493 M (KA = 5.6 x 10^-4) What is the pH of this buffer system?

If 0.100 M HBr is added to the buffer, what is the pH?

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explanation:

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.