Question

Q. 10^-6 M HCl is diluted to 100 times. Its pH is
(a) 6.0
(b) 8.0
(c) 6.96
(d) 9.5​

Answer 1

Answer:

Between 66 and 77

Between 1010 and 1111

Between 77 and 88

Between 55 and 66

Answer :

C

Solution :

After dilution, [OH−]=10−8M[OH-]=10-8M

or [H+]=10−6M.pH[H+]=10-6M.pH cannot be 66 because total

[OH−]=10−7+10−8=10−7(1+.01)[OH-]=10-7+10-8=10-7(1+.01)

=10−7×1.1=10-7×1.1 or [H+]=10−14/(10−7×1.1)[H+]=10-14/(10-7×1.1)

9.09×10−89.09×10-8

∴pH=9−log9.09=8−0.9546=7.0454