If you added 4mL NaOH 1 M to your 100 mL buffer, would it still be a usable

buffer according to our conventions? Explain why or why not (math would be
good here)

1 answer

With no numbers on what you're using for a buffer (concentrations, volumes, etc) there is no way to calculate anything. However, from just a guess viewpoint, I suspect adding 4 mL of 1M strong base, the answer is it would not be a good buffer after that. That's just a guess.