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chemistry questions..hope u all stop by :)

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winnie101:
@ AS girl
i dont know why the replacing of concentrations isnt giving the right answer, but whenever you have to find conc. from pH or pOH you do the inverse of log which is the 10^x button on the calculator. so if you do 10^1.8 you get c.

Amii:

--- Quote from: winnie101 on April 06, 2011, 08:04:58 pm ---@ AS girl
i dont know why the replacing of concentrations isnt giving the right answer, but whenever you have to find conc. from pH or pOH you do the inverse of log which is the 10^x button on the calculator. so if you do 10^1.8 you get c.

--- End quote ---
To calculate [H+] we use 10 -pH right?

And even if you don't include the - sign the answer comes 63.096 =  6.31X 10 -1 NOT 6.31 X 10 -2
 :-\

AS-Girl:
ok i have a similar question..
lets check if our way is right

If the pOH of a juice is 5.00, then the hydroxide ion concentration [H+] of the juice is:
a) 1.00 X10 ^(-9) mole/liter
b) 1.00 X10 ^(+5) mole/liter
c) 1.00 X10 ^(+9) mole/liter
d) 1.00 X10 ^(-5) mole/liter

Amii:

--- Quote --- then the hydroxide ion concentration [H+] of the juice is
--- End quote ---
Hydroxide ion concentration or hydrogen ion concentration ?

[OH-] would be 10-5 =1 X 10 -5 mol/dm3

Thus [H+] =  1 X 10-14
                   --------
                   1 X 10-5

=1X10-9 mol/dm3

NotAbod:

--- Quote from: Amii on April 06, 2011, 09:31:23 pm ---Hydroxide ion concentration or hydrogen ion concentration ?

[OH-] would be 10-5 =1 X 10 -5 mol/dm3

Thus [H+] =  1 X 10-14
                   --------
                   1 X 10-5

=1X10-9 mol/dm3

--- End quote ---
Genius!!
i donno wat are u guys talking about! i am still an igcse newbie

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