The formate ion, (CHO2-), is related tothe acetate ion and forms ionic salts with many metal ions. Assumethat 11.874 g of M(CHO2)2 (where M representsthe atomic symbol for a particular metal) are dissolved in water.When a solution of 0.300 M sodium sulfate is added, a whiteprecipitate forms. The sodium sulfate solution is added until nomore precipitate forms, then a few excess milliliters are added.The precipitate is filtered, washed, and dried. It has a mass of12.115 g. The filtrate is placed aside.
A potassium permanganate solution is standardized by dissolving1.0734 g of sodium oxalate in dilute sulfuric acid, which is thentitrated with the potassium permanganate solution. The principalproducts of the reaction are manganese(II) ion and carbon dioxidegas. It requires 21.50 mL of the potassium permanganate solution toreach the end point, which is characterized by the first permanent,but barely perceptible, pink (purple) color of the permanganateion.
The filtrate from the original reaction is diluted by pouringall of it into a 300-mL volumetric flask, diluting to the mark withwater, then mixing thoroughly. Then 15.00 mL of this dilutedsolution is pipetted into a 125-mL Erlenmeyer flask, approximately35 mL of water is added, and the solution is made basic. Whatvolume of the standard permanganate solution will be needed totitrate this solution to the end point? The principal products ofthe reaction are carbonate ion and manganese(IV) oxide.
