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