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# Questions form "Analytcal Techniques" watch

1. 0.3162g of oxalic acis (H2C2O4.2H2O) was dissolved in water and the solution made up to 250.0mL. Calculate the concentration of the solution.
For this question, do I use c=m/v or c=n/v?

2. What volume of 9.5M sulfuric acid solution, is required to prepare a 550mL standard solution of 0.125M concentration?
I have ...
Acid to end with;
v=550L=0.550mL
c=0.125M
n=0.06875moles.

Mole ratio is 1;1, so the acid to begin with...
c=9.5M
n=0.06875moles
v=7.23mL
Is that correct?

One more question...
"Assuming the density of the origional bleach solution was 1.00g mL^- 1. Is density the same as concentration?

Cheers
2. density isnt the same as concentration, density=mass/volume, use the density to calculate mass or volume depending what u need.. sorry cant really help with the earlier stuff

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