Explain henderson-hasselbach equation

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A buffer solution contains 0.403 M NH4Br and 0.320 M NH3 (ammonia). Determine the pH change when 0.078 mol KOH is added to 1.00 L of the buffer. The answer is .19. But I have no idea how find Ka for this problem, so I can't even begin. I know you're supposed to find Ka first, then use the henderson-hasselbach equation, then ICE. If someone can go in depth into finding the Ka to this and then guiding me through the rest of the steps, I'd be eternally grateful

Reference no: EM13163587

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