Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: zerokun on May 28, 2008, 12:19:39 AM
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In an experiment,
20 microLitre of 20 mili Mol / Litre of phenylphosphate was used.
What is the concentration of phenylphosphate?
I try to calculate by first converting 20 microLitre to 2.0 X 10 ^-3 L
and then, i divide by 20 X 10^-6 L because i use 20 microlitre of phenylphosphate.
So i got 1000 mol L^-1
which is wrong, the correct answer is 0.02
does anyone comes out with any idea in how to calculate this ??? I really need your help.Thxxxx in advance
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In an experiment,
20 microLitre of 20 mili Mol / Litre of phenylphosphate was used.
What is the concentration of phenylphosphate?
I try to calculate by first converting 20 microLitre to 2.0 X 10 ^-3 L
That is wrong
micro = 10-6
and then, i divide by 20 X 10^-6 L because i use 20 microlitre of phenylphosphate.
So i got 1000 mol L^-1
which is wrong, the correct answer is 0.02
But I don't understand why you use / are given the volume data - it is irrelevant in this context
You wrote above
20 mili Mol / Litre of phenylphosphate
This is already a concentration (amount in moles / volume)
So converting to
20 x 10-3 mol litre-1
This gives a concentration of 0.02 mol litre-1 (note the units) - which is the answer you are trying to understand
does anyone comes out with any idea in how to calculate this ??? I really need your help.Thxxxx in advance
Does what I have written make sense to you?
Clive
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Yes, it make sense
The volume is given because there is another question which require too calculate using the formula C1V1=C2V2
I get confuse with the unit but i manage to solve it during lab today
Thxxxx anyway ! ! ! !