The demand for caustic soda in various manufacturing industries continues to grow.Many of these products appear in the sales market.Many customers are concerned that the purity of the products they purchase may not be sufficient to achieve good practical results.
Accurately weigh 1.5-2.0 grams of tablet alkali sample on an analytical balance in a 250 milliliter measuring cup.After releasing water(excluding carbon dioxide),perform quantitative analysis in a 250ml volumetric flask.Dilute tap water to the mark and shake well.
2.Take 25.00 mL(3 portions)of the test sample tablet alkaline solution from a 250 mL conical flask,add a few drops of phenolphthalein indicator,and stop at the endpoint when the standard droplet C(hydrochloric acid)changes from bright red to colorless at 0.1 mmol/L,and record the volume V1 of the hydrochloric acid standard solution.
3.Add a few drops of methyl orange indicator,and then titrate the test tube again with hydrochloric acid standard solution until the aqueous solution changes from light yellow to orange.
4.Record the V2 consumption of hydrochloric acid standard solution.
5.Accurate measurement based on quantitative analysis can accurately measure purity values such as the moisture content of alkali and residue in alkali.
The reason for the decrease in the purity of caustic soda is that a small amount of residue will be formed after preparation,and people hope to know the purity of the product in the future.People can use this method for precise measurement and maintain precise measurement.Be careful to prevent errors and omissions in statistical data.
