PH question, I really don't get this!

  • #1

Homework Statement


What is the [H3O+] of acid rain with a pH of 4.23?


Homework Equations


pH = -log[H30+]
pOH = -log[OH-]
pH + pOH = 14


The Attempt at a Solution



the four possible choices are
a. 1.7 x 10^-10
b. 5.8 x 10^-5
c. 2.3 x 10^-4
d. 1.7 x 10^5
 

Answers and Replies

  • #2
172
2
You are given the pH and need to calculate the concentration of the [tex]H_{3}O^+[/tex] ions. Which equation should you use?
 
  • #3
I know I have to use the first one but I don't know how to do the reverse of it
 
  • #4
5
0
Since pH = -log[H30+] or pH = -log[H+]
H3O+/H+ = 10^(-pH)
 
Last edited:
  • #5
But I dont get how to plug it in on my calculator
 
  • #7
Oh okay I got the answer thank you so much!
 

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