1ya, even i did the same...but ans given is 7 (kya pata book waalon ne average le liya ho galti se!!! :D)
Two solutions of equal volume, but one having pH 4 and other having pH 10, are mixed. What is the pH of the resulting solution?
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UP 0 DOWN 0 0 9
9 Answers
1[H30+] = 10-10+10-4
2
= 5.000005*10-5
now take log and solve.
is the ans around 4.3
please correct if wrong.
111The Ques is same as
Calculate the pH of the solution obtained by mixing equal volumes of 0.0001 M HCl & 0.0001 M NaOH.
eq. of HCl = eq. of NaOH
So,resultant soln. is neutral. ∴ pH=7
Calculation of pH of a mixture by the method given by ankit,can be used only for 2 acidic solns. or 2 basic solns.
1the book seems to right
2nd one is basic dat means there must 10 to power -4 oh- ions and it will neutralise the first one and thus neutral......i.e ph is 7 .......!
62my wrong..
manish just pointed this out to me...
[H30+] = (10-10+10-4)/2
[OH-] = (10-10+10-4)/2
Now both can react back to form H2O
so the concentration will fall back to value of such that pH=10-14
So [H+]=10-7
1yup......................
4 5 6 7 8 9 10................4 is equally far from 7 as 10 is ............ie both are either 3 more or 3 less...........................so the pH becomes 7............(neutral)