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[CW3]

I need some confirmation or correction on an issue. I have a container of 2.75% (w/v) Calcium Chloride. Can I say that this is a 0.25M solution? Given the molecular weight of CaCl2 is 110.98g, is this a correct statement?

Thanks,

CW3

 

[btrueblood]

Not sure what you mean by w/v, or if the container is a water solution?

Do you mean 2.75% by weight of CaCl2 in water (solution)? I.e. 2.75 g of salt in 100 g of solution.

Then yes, I calculate .25M concentration too.

 

[mohtogh]

Yes, but if you want mention solution in w/v (weight to volume) you should mention units too: w/v gr/ml
w/v by itself is not clear.

 

[CW3]

Yes, (w/v) is weight to volume (g/mL). Thanks.I am titrating di-ammonium EDTA with the calcium chloride to determine % available pure EDTA and just needed to be sure of the molarity of the calcium chloride I had on hand.

You guys' input is very much appreciated, thanks.

CW3

 

[25362]

Be sure you are using the anhydrous (hygroscopic) salt. Otherwise, the commercial salt frequently available is the dihydrate MW: 147.01. In which case the resulting molar concentration may be lower.