A 50.00 mL sample of 0.0950 M acetic acid (Ka = 1.8 10-5) is being titrated with 0.106 M NaOH.
The teacher said the pH at the equivalence point of the titration is 8.72 but I don't understand why. I thought pH at equivalence point was suppose to be 7? Can someone help me please?
2007-04-15 17:19:39 · 1 answers · asked by purple222 2 in Science & Mathematics ➔ Chemistry
It is a myth that all salts have a pH of 7. In titrations, at the equivalence point there is just salt and water, but the pH very much depends on what two chemicals have been added. If the salt was made from a straong acid and a strong base, then its pH will be around 7, but if it comes from a weak acid and a strong base (like your example) then it will be alkaline, and if it comes from a weak base and a strong acid, then it will be acidic. This is known as hydrolysis.
2007-04-16 06:47:30 · answer #1 · answered by Gervald F 7 · 1⤊ 0⤋