Acid/Base pH

  • #1
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?
 

Answers and Replies

  • #2
Gokul43201
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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.
 

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