Many plants are poisonous because their stems and leaves

Last updated: 7/27/2022

Many plants are poisonous because their stems and leaves contain oxalic acid, H₂C₂O4, or sodium oxalate, Na2C2O4; when ingested, these substances cause swelling of the respiratory tract and suffocation. A standard analysis for determining the amount of oxalate ion, C₂O4², in a sample is to precipitate this species as calcium oxalate, which is insoluble in water. Choose the right net ionic equation for the reaction between sodium oxalate and calcium chloride, CaCl2, in aqueous solution. 2Ca²+ (aq) + C₂04² (aq) → Ca₂C₂O4(s) Ca²+(aq) + C₂O4²- (aq) → CaC₂O4(s) Ca²+ (aq) + 2C₂O4²- (aq) → Ca(C₂O4)2 (8) Ca²+ (aq) + C₂ 04² (aq) → CaC₂O4 (aq)