If sodium hydroxide solution is added to an unbuffered solution of pure water, what is the change in pH?

Question

Will the pH increase or decrease?
(if say I add 0.1cm3 of NaOH to 20cm3 of water and I measured the pH of the solution each time I added the NaOH solution)

Answer 1

The pH value would increase, by how much would depend on the volume and concentration of the sodium hydroxide used.

2.0Molar would have a much greater effect than 0.1Molar in the same volumes added to your water.

Answer 2

The water which now becomes a solution of sodium hydroxide has a pH of 14.00.

I must point out some problems in your question. You can't have an unbuffered solution of pure water. Water is a compound of hydrogen and oxygen. If it is PURE the hydrogen and oxygen ions will disassociate in equal quantities giving a pH of 7.0. When the sodium hydroxide is added this balance is disturbed and the negatively charged hydroxyl ions -OH throw the charge to 14.

Hope this helps. If it was a similar solution of strong acid it would be pH 1.0

Answer 3

As NaOH is alkaline and water is neutral, the pH will rise from 7 to around 13, as NaOH is a strong base. However, the final value does indeed depend on the concentration of NaOH used.

Answer 4

NaOH change the pH level of pure water by increasing the pH which is more alkaline,because OH or Oxide can change the pH of the solution become more alkaline and for the hydrogen ions ,it can change the pH of the solution become more acidic.

Answer 5

The pH Will increase since you add NaOH which is a Strong base.

I can not solve this problem since i do not know the normality of your solution of NaOH

Answer 6

sodium hydroxide is a base so the pH will increase

Answer 7

Becomes more Alkaline, ie pH increases.

Answer 8

don't you mean distilled water?litmus paper will give you the ph.
sounds like a dope recipe to me though so,thats about all i will tell you.

Answer 9

a helluva lot!