Answer to Question #79254 in General Chemistry for John

Question #79254

If you have one litre alkaine water at a ph of 12 how many extra litres of normal water would have to be added to bring the ph down to 7?

Expert's answer

pH values are determined on a logarithmic scale. pH values are reported as a number between 0 and 14 as a standard pH unit. This unit is equivalent to the negative logarithm of the hydrogen ion molar concentration (-log(H+)) in the solution.

pH = 12, [H+] = 10-12 mol/L

pH = 7, [H+] = 10-7 mol/L

20 extra litres of normal water would have to be added to bring the pH down to 7.

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Assignment Expert

27.07.18, 14:33

Dear John There are no formulas. This is a substitution method.

John

26.07.18, 16:24

Thankyou for your answer. Is there a formula that you can show as to how you arrived at the 20 litre figure? E.G. if I want to change the values say pH14 to pH9 how do I do it? Thanks

john

23.07.18, 16:13

Thankyou for your answer. Is there a formula that you can show as to how you arrived at the 20 litre figure? E.G. if I want to change the values say pH14 to pH9 how do I do it? Thanks

Answer to Question #79254 in General Chemistry for John

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