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# Molecular Equation: Calcium Nitrate and Sodium Oxalate

CHEM-7APTXY

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 ${ }^{ o }C$.

Write the molecular equation for the reaction that occurs when 15.0 mL of 0.1 M calcium nitrate aqueous is added to 15 mL of 0.1 M sodium oxalate aqueous solution at 20 ${ }^{ o }C$.

A

$Ca(N{ O }_{ 3 }{ ) }_{ 2 }(aq)\space +\space { Na }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }(aq)\space \longrightarrow \space Ca{ C }_{ 2 }{ O }_{ 4 }(s)\space +\space 2NaN{ O }_{ 3 }(aq)$

B

$Ca(N{ O }_{ 3 }{ ) }_{ 2 }(aq)\space +\space { Na }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }(aq)\space \longrightarrow \space Ca{ C }_{ 2 }{ O }_{ 4 }(s)\space +\space NaN{ O }_{ 3 }(aq)$

C

No reaction.

D

${ Ca }^{ 2+ }(aq)\space +\space { C }_{ 2 }{ O }_{ 4 }^{ \space 2- }(aq)\space \longrightarrow \space Ca{ C }_{ 2 }{ O }_{ 4 } (s)$