1. Aug 16, 2005 #1

   answerseeker

   

   when you add 10.0 mL of 1.0M HClO4 into 990.0mL water, the pH changes by 2.
   how would you find the change in pH?

    

   answerseeker, Aug 16, 2005
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3. Aug 17, 2005 #2

   Gokul43201

   

   Staff Emeritus

   Science Advisor

   Gold Member

   1. Write out the expression that defines pH
   2. Assume HClO4 is close to 100% dissociated in solution
   3. From the original concentration of HClO4, find [H+] and calculate the original pH from this
   
   4. Calculate the new (diluted) concentration of HClO4 (molarity = number of moles/volume of solution)
   5. Using the new value of [H+], calculate pH again.
   6. Subtract from the original number to find the difference.

    

   Gokul43201, Aug 17, 2005

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