3. Calcium Formate Content Determination
3.1 Calcium Formate Method Overview: In a slightly alkaline calcium formate solution, add an excess of potassium permanganate standard solution. Heat to ensure the oxidation reaction proceeds to completion. The excess potassium permanganate will liberate iodine from potassium iodide in an acidic solution, which is then titrated with sodium thiosulfate standard solution.
3.2 Calcium Formate Determination Steps:Weigh approximately 0.4g of calcium formate sample (accurate to 0.0002g), place it in a 250ml volumetric flask, dissolve it in water, dilute to the mark, and shake well. Pipette 25.00ml (or 10ml) of this solution into an iodine flask, add 0.2g of anhydrous sodium carbonate, and shake well.Accurately add 50.00ml (or 20ml) of potassium permanganate standard solution, heat in a water bath for 30 minutes, then cool. Add 6ml of sulfuric acid solution and 2g of potassium iodide, let it stand in the dark for 5 minutes. Titrate with sodium thiosulfate standard solution; near the endpoint, add 3ml of starch indicator (0.5%), and continue titrating until the blue color disappears. Perform a blank test simultaneously.

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