[desperate4ananswer]

I get it when I'm asked to prepare a buffer made up of weak acid and a strong base but I don't know how to prepare one with a weak base and a strong acid.

The question is:-
Prepare 1L of pH9 buffer from ethanolamine (liquid, specific gravity 1.1, Molecular weight=61) and HCl solution (1.0mol/L).

Somebody could help me with this, it would be greatly appreciated.

Thank you.

[AWK]

You need Kb of ethanolaamine

[Borek]

It goes exactly the same way as when using weak acid, you just use pOH and pK_b. See pH of buffer.