Preparing a buffer by combination of weak acid and conjugate base find out the effect of adding others, assignment help

a buffer has been prepared by mixing a .65 moles of weak acid (HA) and its conjugate base (NaA).55 moles. Consider the Ka value of the weak acid as 2.95×10^-5. Find out the effect of adding the following amount of acids or bases to this buffer. Consider the original volume of buffer as 1L and there is no change in volume by the addition of acids or bases.

A) 1 mole HNO3

B) .087 moles H3PO4

C) .22 moles Ba (OH)2

D) .33 moles LiOH

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