yesterday I had a solution with ph 6, then I put NaOH and I rised the ph to 7, afterwards I put 200 mL of dest water (ph 7.8), but the ph of the solution remined at 7, why the water adding didnt increase the pH????
2007-04-12 20:12:23 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Destilate water does not has pH of 7, CO2 reacts wih H2O so to produce HCO3, called the water natura acidity
2007-04-12 20:26:01 · update #1
Distilled water has a pH of 7.
EDIT: You are correct. Distilled water exposed to the atmosphere has a pH of about 5.8. What you have probably done in raising a solution of some acidic compound from 6 to 7 is create a buffer solution, with conjugate base ions as well as H+ ions in solution. This solution will resist changes in pH.
2007-04-12 20:15:48 · answer #1 · answered by gp4rts 7 · 0⤊ 0⤋
An increase in pH indicates a DECREASE in acidity and an INCREASE in alkalinity.
The addition of water does not increase the alkalinity of your solution, thus no increase in the pH is observed.
2007-04-12 20:37:46 · answer #2 · answered by lmmonisit 2 · 1⤊ 0⤋