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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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oates151 oates151
wrote...
11 years ago

Please also explain how to find this.  And can this question be found the same way: If a sample of water changes from pH 8 to pH 7 how many more hydrogen ions are in that sample of water?
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wrote...
#1
11 years ago
The pH is the negative logarith of the molar H+ concentration.        
A pH 0f 5.0 is equivalent to [H+]  = 1 x 10^-5 molar H+ concentration  (0.00001 molar)
wrote...
#2
11 years ago
The definition of pH is:  pH = -log of the {H3O+}   The square bracket means moles per litre.  
In your examples the answers are made simple.  
pH 5 means 1x10-5 M   pH8 = 1x10-8 M
Som learn how to find the pH when the H3O+  concentration is 1.5 x 10-6  M  
pH = look up the log of 1.5 and subtract it from 6.00   Log = 0.18  Ans. = 5.82
This is the short-cut way if you are not mathematically inclined.  Find the pH of a solujtion that contains, 4.1 x 10^- 4 hydrogen ions

3.39
wrote...
#3
11 years ago
Hello there!

Well this is very simple basically the formula you have to know very well is ph=-log [H]
from there you can always calculate the ph and/or the concentration of the H ion

if you have a ph=5 then by applying the inverse of the log you have that [H]= 10^-5
that will give you the answer

The same thing applies for [OH] and poh, poh=-log[OH]

Good luck Wink Face
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