Finding pH Values for Acids and Bases Without Experiments

AI Thread Summary
The discussion revolves around finding pH values for various acids and bases without conducting experiments. The original poster is struggling to determine the pH of several substances, including hydrogen peroxide and isopropyl alcohol, after failing to complete a previous assignment. Participants clarify the relationship between hydrogen ion concentration and pH, explaining the formula pH = -log [H+]. A helpful resource is shared, which aids the original poster in understanding the concept better. Ultimately, the discussion emphasizes the importance of online resources for grasping pH calculations.
AngelShare
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I have to place two acids and two bases from a previous assignment on a pH scale using the information I acquired during that particular experiment. The problem is, I couldn't get all the materials I needed so I didn't get to do the assignment. I've been able to figure out what vinegar's pH is but I can't seem to figure out any others. Does anyone know of any sites I could use?

The things I can place are as follows:

Hydrogen peroxide
Isopropyl alcohol
Saline solution
Pepto-Bismol
Tonic water
 
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Ah, I'm completely lost...:bugeye:

What is the relationship between [H+] and pH?

pH = -log [H+]

H3O+

I'm trying, desperately, to grasp something but my mind is blank. I'm not comprehending anything here...help...:cry:
 
AngelShare said:
Ah, I'm completely lost...:bugeye:

What is the relationship between [H+] and pH?

pH = -log [H+]

H3O+

I'm trying, desperately, to grasp something but my mind is blank. I'm not comprehending anything here...help...:cry:

You've given the relationship pH = -log [H+].

In this equation, [H+] is the concentration of the hydorgen ion in the solution. So, if you take the negative log of the hydrogen ion concentration (to the base 10), you get the pH.

Do you understand now?
 
Yes, I found another site that explained it better, worked through a couple of problems, and figured it out.:smile:
 
Ah, good site Borek, thanks!:biggrin:
 
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