calculate the change that occurs in pH when 0.010 moles of gaseous HCl is added to 1.0L of the following solution:
Solution A: 6.00M HC2H3O2 and 5.00M NaC2H3O2
pH of solution A?
pH of solution A and HCl?
can someoe please help me answer this? and explain how it is done.
THANK YOU
2007-12-12 07:18:59 · 1 answers · asked by abc 1 in Science & Mathematics ➔ Chemistry
Acetic acidis a weak acid and you have an acetic acid - acetate buffer. So A is a buffer solution. Use definition of Ka, or else Henderson-Hasselbach equation.
When you add HCl, it all reacts with C2H3O2- to convert it to C2H3OH. So C2H3O2- goes down by amount of added HCl, and C2H3O2H goes up by the same amount.
Now repeat your calculation. There won't be much change. Compare this with what would have happened to pH if you'd added that much HCl to water.
Now you know how buffers work!
2007-12-12 07:59:17 · answer #1 · answered by Facts Matter 7 · 0⤊ 0⤋