1.

Which of the following solutions will have pH close to 1.0

Answer»

100 ml of (M/10) HCl + 100 ml of (M/10) NaOH
55 ml of (M/10) HCl + 45ml of (M/10) NaOH
10 ml of (M/10) HCl + 90 ml of (M/10) NaOH
75 ml of (M/5) HCl + 25 ml of (M/15) NaOH

Solution :As `N_(1)V_(1) gt N_(2)V_(2)`
So acid is left at the end of reaction
`N_("FINAL solution") = [H^(+)] = (N_(1)V_(1) - N_(2)V_(2))/(V_(1)+V_(2))`
`= ((1)/(5)XX 75-(1)/(5)xx 25)/(75+25) `
`= (1)/(10) = 0.1 = PH = -LOG[H^(+)] = 1`


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