Posted by **Jenny** on Monday, December 8, 2008 at 1:54am.

The hydrogen ion concentration of a substance is related to its acidity and basicity. Because hydrogen ion concentrations vary over a very wide range, logarithms are used to create a compressed pH scale, which is defined by pH=-log(H+)where (H+)is the hydrogen ion concentration, in moles per liter. Pure water has a pH of 7, which means it is neutral. Substances with a pH less than 7 are acidic, and those with a pH greater than 7 are basic. Compute the pH of each substance listed given the indicated hydrogen ion concentration. Assume that log(H+) is written with base 10.

a. Seawater, 4.63x10^-9

b. Vinegar, 9.32x10^-4

Thank you!!

- College Algebra -
**drwls**, Monday, December 8, 2008 at 2:13am
All you have to do is compute the logs to base 10 of 4.63x10^-9 and 9.32x10^-4 , and add a minus sign.

For seawater, the answer is 8.33, which is 9.00 - log 4.63

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