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About 80% of kidney stones are of calcium oxalate type, which forms when calcium (${ Ca }^{ 2+ }$) and oxalate (${ { C }_{ 2 }{ O }_{ 4 } }^{ 2- }$) levels in blood are too high. The solubility of calcium oxalate ($Ca{ C }_{ 2 }{ O }_{ 4 }$) is only 6.7 mg/L at 20 ${ }^{ o }C$.

To 15.0 mL of water is added 5.0 grams of calcium oxalate powder at 20 ${ }^{ o }C$.

After thorough mixing and centrifuging, which of following is the BEST description of the resultant clear liquid?

A

It is pure water.

B

It is saturated with calcium oxalate.

C

It can dissolve more calcium oxalate.

D

It contains 15 mL of water and 5 grams of sodium oxalate.

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