acid question (1 Viewer)

[clever angel]

can ne one answer this tricky q'n

a series of ten fold dilutions was carried out on a solution of 0.01mol/l of nitric acid

wat is the minimum concentration of hydrogen ions that can e ibtainedd by successive dilutions of HNO3

ans is 0.0000001 mol/l


thus ph of 7

plzz hsow working

 

[LostAuzzie]

Well the best answer I can give you is that because HNO3 is an acid as you keep diluting it you are increasing the pH. The maximum you can reach is pH 7 because that (theoretically although not always the case) is the pH of the water with which you are diluting the HNO3.

 

[Dreamerish*~]

Lostaussie is right.

Nevermind the minimum concentration of H⁺ and focus on the pH. Because you are diluting the acid with water, you cannot possibly obtain a pH of >7 because the pH of water is ~7.

As the acid is diluted, the pH rises, but since the solution can never be alkaline, the maximum pH is 7, when the concentration of H⁺ is so small that it is not taken into account.

Using the rule [H]⁺ = 10^-pH

[H]⁺ = 1 x 10^-7 = 0.0000001 mol/L.