1. ## pH calculation question

Question:

The pH of an acid is given as 5.0 and it is also triprotic. Calculate the hydrogen ion concentration of the acid.

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Just checking, the proticity of the acid shouldn't affect the concentration of the H3O+ ions right? (i.e. it's already taken into account when the pH was calculated?)

2. ## Re: pH calculation question

I think you have to first calculate the H+, i.e. [H+] = 10^-pH and then divide by 3 to get the concentration. Divide by 3 because its triprotic

3. ## Re: pH calculation question

Originally Posted by Bestintheworld
I think you have to first calculate the H+, i.e. [H+] = -10^pH and then divide by 3 to get the acid concentration. Divide by 3 because its triprotic
Isn't the question just to find the H+ ion concentration though? (as opposed to finding the acid concentration)

4. ## Re: pH calculation question

Originally Posted by Shuuya
Isn't the question just to find the H+ ion concentration though? (as opposed to finding the acid concentration)
I edited my answer, it should have been like that above. I am not 100% sure though..

5. ## Re: pH calculation question

Originally Posted by Bestintheworld
I edited my answer, it should have been like that above. I am not 100% sure though..
Ok, thanks

I was pretty sure that you only had to do that to get the acid concentration though, not sure... :/

6. ## Re: pH calculation question

Originally Posted by Shuuya
I was pretty sure that you only had to do that to get the acid concentration though, not sure... :/
That's what I thought too..
Pretty sure you neglect the proticity of the acid, it shouldn't affect the concentration of the H3O+ ions

But then again, not completely sure bc we just started this and completely missed the lesson

7. ## Re: pH calculation question

[H3O+]=10^-pH

That's enough

8. ## Re: pH calculation question

Originally Posted by leehuan
[H3O+]=10^-pH

That's enough
Thought so

10. ## Re: pH calculation question

Originally Posted by Carrotsticks
God Cat

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