Chemistry-
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Question

At 90℃, pure water has H subscript 3 end subscript O to the power of plus end exponent ion concentration of 10 to the power of negative 6 end exponent m o l divided by L to the power of negative 1 end exponent. The K subscript w end subscript a t blank 90 ℃ is

  1. 10 to the power of negative 6 end exponent  
  2. 10 to the power of negative 14 end exponent  
  3. 10 to the power of negative 12 end exponent  
  4. 10 to the power of negative 8 end exponent  

The correct answer is: 10 to the power of negative 12 end exponent


    K subscript w end subscript equals open square brackets H to the power of plus end exponent close square brackets left square bracket O H to the power of minus end exponent right square bracket
    equals open parentheses 10 to the power of negative 6 end exponent close parentheses cross times open parentheses 10 to the power of negative 6 end exponent close parentheses left parenthesis because open square brackets H to the power of plus end exponent close square brackets equals left square bracket O H to the power of minus end exponent right square bracket right parenthesis
    equals 10 to the power of negative 12 end exponent

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