Question

the calcium ion can be identified by the formation of calcium oxalate, cac₂o₄ a ______ precipitate.
a white
b red
c green
d orange

Explanation:

In chemical analysis, calcium ion (\(Ca^{2+}\)) reacts with oxalate ion (\(C_2O_4^{2 -}\)) to form calcium oxalate (\(CaC_2O_4\)), which is a white precipitate. This is a standard test for the identification of calcium ions in qualitative analysis. The other colors (red, green, orange) are not associated with calcium oxalate precipitate.

Answer:

A. White