Can you always use the Henderson Hasselbach equation or is it only when the concentration of the weak acid and its salt are equal? I'm self teaching so somewhat struggling with this section!
Can you always use the Henderson Hasselbach equation or is it only when the concentration of the weak acid and its salt are equal? I'm self teaching so somewhat struggling with this section!
Can you always use the Henderson Hasselbach equation or is it only when the concentration of the weak acid and its salt are equal? I'm self teaching so somewhat struggling with this section!
You can always use it.
When [A-]=[HA] it simplifies nicely. But so does just using Ka.
S/he might have been answering "No." to your second Q (is it only when the concentration of the weak acid and its salt are equal?).
I'm not a fan of H-H; I don't think it is any easier than just using Ka. But then again, I'm a bit of a mathophile. This is my tenth year of teaching A-level chemistry and I've got by without it.