[Soda Ash Knowledge] Daily Question (46) 11/18/2009
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Please hide the reply; no scoring will be given in principle if it is not hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Posts that have been edited are not rated. (The question for this issue is taken from page 72 of \"Technical Worker Training Question Bank – Soda Ash Production Operators.\" An electronic version of this book is available for download in the soda ash resource sharing area: http://bbs.hcbbs.com/thread-13140-1-2.html) True or False question: 16. When determining the moisture content in the product Na2CO3, gravimetric analysis is used. （ ） 17. The analysis of the components in the mother liquor during the alkali production process is a qualitative analysis. ( ) 18. The common method for determining the iron content in soda ash products is the o-phenanthroline spectrophotometric method. （ ） 19. When conducting screening, the test sieves should be stacked from bottom to top in order of decreasing pore size. （ ） 20. When determining the loss on ignition of Na2CO3 products, the temperature of the high-temperature furnace should be controlled at (800±50)°C. ( ) 21. When measuring TCL- in the ammonia mother liquor, 5 ml of the original sample can be taken and diluted to 100 ml; then 5 ml of this diluted sample is taken for direct titration with AgNO3. （）
This post was last edited by lxq700918 on 2009-11-18 09:07. 16. To determine the moisture content of Na2CO3 in the product, gravimetric analysis is used. (∨) 17. The analysis of the components in the mother liquor during the alkali production process is a qualitative analysis. (∨) 18. The general method for determining the iron content in soda ash products is the o-phenanthroline spectrophotometric method. (∨) 19. When conducting screening, the test sieves should be stacked from bottom to top in order of decreasing pore size. (∨) 20. When determining the loss on ignition of Na2CO3 products, the temperature of the high-temperature furnace should be controlled at (800±50)°C. (×) 21. When measuring TCL- in the ammonia mother liquor, 5 ml of the original sample can be taken and diluted to 100 ml; then 5 ml of this diluted sample is taken for direct titration with AgNO3. (∨)hide] 1# chen3jun
16. When determining the moisture content of Na2CO3 in the product, gravimetric analysis is used. (Correct) 17. The analysis of the components in the mother liquor during the alkali production process is a qualitative analysis. (Incorrect) 18. The common method for determining the iron content in soda ash products is the o-phenanthroline spectrophotometric method. (Yes) 19. When conducting screening, the test sieves should be stacked from bottom to top in order of decreasing pore size. (Incorrect) 20. When determining the loss on ignition of Na2CO3 products, the temperature of the high-temperature furnace should be controlled at (800±50)°C. (Incorrect) 21. When measuring TCL- in the ammonia mother liquor, 5 ml of the original sample can be taken and diluted to 100 ml; then 5 ml of this diluted sample is taken for direct titration with AgNO3. (Mistake)