Can someone help me with this question please? im having a hard time with these types of questions
Explain why the salt of a weak acid, as well as the acid itself, must be present to form a buffer solution.
1) actually, a weak aid by itself is a buffer, no salt is needed
2) the cation from the salt is needed to partially neutralize added acid.
3) the anion from the salt is needed to partially neutralize added base.
4) the cation from the salt is needed to partially neutralize added base.
5) the anion from the salt is needed to partially neutralize added acid.
2007-11-07 06:01:15 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
The answer is 5)
Consider a solution of acetic acid and sodium acetate, HC2H3O2 and Na+ + C2H3O2-. If you add H+, then
C2H3O2- + H+ ===> HC2H3O2
Because HC2H3O2 is only a few % ionized, the added H+ gets tied up and cannot drop the pH as much as it would if the C2H3O2- were not there.
2007-11-07 06:23:50 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋