# Precipitation of citric acid by CaCl2 and Ca(OH)2? [closed]

I need to precipitate citric acid from an aqueous solution in the form of calcium citrate. There are, to my knowledge, two different methods of doing this:

1. using $\ce{CaCl2}$ and which will react in an unknown way
2. using $\ce{Ca(OH)2}$ which will react as such:

$$\ce{2C6H8O7(aq) + 3Ca(OH)2(s) <-->Ca3(C6H5O7)2 . 4H2O(s) + 2H2O}$$

Does anyone know the pros and cons of each method and how the reactions occur with the first method?

## closed as off-topic by A.K., andselisk♦, user55119, Todd Minehardt, TyberiusApr 22 at 14:56

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• I don't get the "unknown" part. Calcium chloride is highly soluble in water, whereas less than 1 g tricalcium citrate dissolves in 1L water. – Klaus-Dieter Warzecha Apr 19 '16 at 19:14