Solution-Two mixed dilute aqueous solutions

A buffered solution is prepared by mixing 100.0 mL of 0.250 M NH3(aq) and 150.0mL of 0.200 M NH4NO3(aq).

a) Calculate the pH of this buffer. Assume that the volumes of the two mixed dilute aqueous solutions are aIDitive.

b) What will the pH become after 0.63 g HNO3 is aIDed to the buffered solution?

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