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Unformatted text preview: Kw for the answers below. Use the rules for logarithms and exponents to solve for K w in terms of pK w . ... K w = Correct answer: Your response: If ... pK w = 7.15 ... then ... K w = 7.08E-8 Feedback: In order to solve for K w you must clear the logarithm. Step 1 ... Multiply both sides of the equation by (-1) .- pK w = log K w Step 2 Raise both sides of the equation to the base 10 . 10- pK w = 10 (log K w ) Step 3 Simplify the right side of this equation using the rule 10 log a = a. 10 (log K w ) = K w The resulting equation is: K w = 10-pKw If ... pK w = 7.15 ... then ... K w = 10-7.15 = 7.1E-8 K w is equal to 1.0 x 10-7 at 25 o C. It changes slightly with temperature....
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- Fall '11