When using caustic soda, there are usually certain regulations on its content. Due to its strong alkalinity, it is often necessary to determine its dosage when using it. However, the purity of products produced by different manufacturers may vary, which may lead to different usage effects. Therefore, we need to test their purity values before use.
1. Weigh approximately 1.5-2.0g of caustic soda on a scale with a precision scale, place it in a 250ml beaker, dissolve it in water, and quantitatively pour it into a 250ml volumetric flask. Dilute with water to the rated scale and shake evenly.

2.Pour 25.00 mL of the test solution into a 250 mL conical flask,then add two drops of phenolphthalein indicator separately.Titrate the standard solution with C=0.1 mol/L until the solution changes from red to colorless,and then stop.Record the volume V1 of the hydrochloric acid standard solution used.
3.Add two drops of methyl orange indicator,then continue titrating with the above hydrochloric acid standard solution until the tablet alkali solution changes from yellow to orange,and then stop.
4.Record the consumption amount V2 of hydrochloric acid standard solution.
After quantitative measurement,the content,impurity content,and purity value can be accurately calculated.
The above introduction is about how to detect the purity value of caustic soda.Because the purity and effectiveness of products from different batches vary,in order to achieve the expected results during use,we need to test their purity.If you still have any questions,you can continue to follow our website and we will keep updating.