Weight-to-volume of anhydrous calcium?

[BtheReef]

Randy,

Prestone Heat is sold in a 9.5lb container. How can I convert this to a cups per container number?

Do I use either of these two numbers to find the volume for other chemical compounds?

density - 2.15 g/cm3 (anhydrous)
solubility - 74.5 g/100 cm3

Thank you!

 

[BtheReef]

Those numbers are specific to anhydrous calcium chloride, I meant if density or solubility in general are used to find volumes for compounds.

 

[Randy Holmes-Farley]

First, I'll ask what you want to do with the number. I would not assume that Peladow is anhydrous (it is not completely anhydrous, but is 91% minimum CaCl2 by weight) .

Also, if you are using it in my recipes, just use 20% less by volume than Dowflake.

Now, to answer the specific question:

You need to know the bulk density to convert weight of solid particles to volume. The density you show is for an individual crystal.

Peladow's bulk density is:

Bulk density: 60ââ"šÂ¬Ã¢â‚¬Å“68 lbs/cu. ft.
http://www.dow.com/calcium/product/pela_dg.htm

You can use this calculator to convert that to grams per liter:

http://www.onlineconversion.com/density.htm

= 961 - 1089 grams per L

and then divide by 4.2 cups per to get:

228 - 259 grams per cup.

That container holds 9.5 pounds = 4,300 grams, so

16.6-18.9 cups

FWIW, this calcium calculator shows values for Peladow type materials:
Reef chemicals calculator
http://home.comcast.net/~jdieck1/chem_calc3.html

 

[BtheReef]

I knew you would have the answer I was looking for

I want these values so I can convert the amount purchased into actual usage.

Such as:
Purchase 9.5lb Prestone Heat
2 cups per gallon of solution (20% less than recommended for dow)
I use 1 gallon of solution #1 every 38 days.
So, this particular amount will last for about 10-11 months.

Is the variance in volume and density based on how much water is present in the final product?

btw, I have most of your articles and the onlineconversion site on my quicklinks bar

Thanks for sharing your knowledge.

 

[Randy Holmes-Farley]

Is the variance in volume and density based on how much water is present in the final product?


That, and possibly other issues relating to particle size distribution.

You're welcome and good luck.