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Strength Test for Caustic SodaIn Textile Processing the following materials are considered to be basic chemicals or bulk chemicals used in processing. The quality of each product whether basic or auxiliary chemical would certainly affect the final quality of textile processing. So a good dye-house should have a continuous quality monitoring procedure like one shown below. As and when a new product or chemical enters your dye-house, its quality should be compared with the previous supply without fail. Caustic Soda lye: Take approximately 25 grams of caustic diluted to 500 ml. From this take 20ml and titrate with 1 N, H2SO4 using phenolphthalein as indicator. Percentage Strength = V x 40 x 100/ 20 x 2 x wt where V is the volume of H2SO4 consumed and wt = 25/500 x 20 grams. Conversion of Caustic soda concentrations: To convert a weight of a caustic soda solution to a weight of solid caustic soda, multiply by the %w/w content and divide by 100. Example: How much sold caustic soda should be used in place of 12 kg of 100TW caustic soda (% w/w = 47.33)? Calculation: 12 x 47.33/100 = 5.7 kg NaOH solid. To convert a volume of caustic soda solution in to weight of solid caustic soda, multiply the volume, in liters, by the g/l content of the solution. Example: How much solid caustic soda should be used in place of 12 liters of 48.1°Be (-710g/l NaOH) caustic solution? Calculation: 12 x 710 = 8520g = 8.5kg of NaOH solid. Specific Gravity and concentration of Caustic Soda solutions at 20C
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