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quick chem pH question

 
 
Reply Sun 12 Jun, 2005 08:17 pm
hey i can't figure this question out...

"What is the pH of the 1.0x10^-8 M HCL?"

could i please have some help? Smile

Thanks

Sarah
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Type: Discussion • Score: 1 • Views: 642 • Replies: 5
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lpenviro
 
  1  
Reply Sun 12 Jun, 2005 08:46 pm
If PH 7 is nutral
Accidic is 1 to 7
0.00000001 is extreme accidic Hydrocloric acid = nearly as accidic as my X wilf's personality
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Sarahisme
 
  1  
Reply Sun 12 Jun, 2005 08:56 pm
huh? what does that have to do with my question?
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patiodog
 
  1  
Reply Sun 12 Jun, 2005 09:38 pm
Well, that's a really low concentration of HCl, right? Lower than the concentration of hydronium ions in distilled water, right?
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raprap
 
  1  
Reply Sun 12 Jun, 2005 09:57 pm
The {H+}of neutral water (pH=7) is 1E-7. This HCl is a really weak solution (1E-8) of a strong acid, so you add the [H+] together (it's called the 5% rule and is used for weak acid solutions when the contribution of [H+] from the water is more than 5% of the [H+] from the acid), so in this case [H+]=1E-7+1E-8=1.1E-7.

And

pH=-log(1.1E-7)=6.96

This is a very weak acid solution.

Rap
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Sarahisme
 
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Reply Sun 12 Jun, 2005 10:09 pm
ok sounds good, thanks Smile
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