A 1.0-l buffer solution initially contains 0.30 mol of nh3 and 0.30 mol of nh4cl what mass of the correct reagent should you add?

To find the mass of reagent to be added in the reaction, we need to determine the pH of the buffer. Using the following equation

pH = pKa + log ([NH3] / [NH4+])

= 9.26 + LOG (0.3 / 0.3)

= 9.26

[h+] = 5.5x10^-10 M, you need to increase that concentration for a ph of 8.6, [H+] needs to be 2.51x10^-9M

2.51x10^-9 moles - 5.5x10^10 moles = 1.96x10^-9 moles

1.96x10^-9 x 36.45g/mole = 7.14x10^-8 g

So the mass of HCI that you should add to the reaction is 7.14x10^-8 g