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The ability of salt, NaHCO 3 and vinegar for washing bleaching agent in bean sprout

The ability of salt, NaHCO 3 and vinegar for washing bleaching agent in bean sprout. Members. Advisor. Dr. Usa Jeenjenkit. Introduction. Have you ever eaten bean sprout ?. I am sure you have ever eaten it. Because it is in many Thai dishes.

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The ability of salt, NaHCO 3 and vinegar for washing bleaching agent in bean sprout

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  1. The ability of salt, NaHCO3 and vinegar for washing bleaching agent in bean sprout

  2. Members

  3. Advisor • Dr. UsaJeenjenkit

  4. Introduction • Have you ever eaten bean sprout ? I am sure you have ever eaten it. Because it is in many Thai dishes

  5. But do you know that there are foxy merchant use bleaching agent in bean sprout. Na2S2O4 Sodium Hydrosulfite Sodium Dithionite And this chemical substance is toxic.

  6. It made us thought that can we wash bleaching agent in bean sprout ? • but what we will use. • Then we thought what our moms always use to wash vegetable . It is NaCl Vinegar and NaHCO3

  7. Our inquiry question Can The solution of Nacl , Vinegar and NaHCO3 wash bleaching agent in bean sprout better than pure water ?

  8. Material & Methods For the experiment, we prepared 3 solution of Vinegar, NaHCO3 and salt with 3 different concentration

  9. First ,we used vinegar 2% , 3% and 5% V/V by using 500 cm3 of volumetric flask : added Acetic acid (CH3COOH) 10, 15 and 25 cm3 into each flask ,filled in water until the volume of solution was 500 cm3, mixed them together example of vinegar solution

  10. Then we used NaHCO3 3%, 4% and 5% M/V by using 500 cm3 of volumetric flask : added NaHCO3 15, 20 and 25 g into each flask ,filled in water until the volume of solution was 500 cm3, mixed them together NaHCO3

  11. Next, we used salt 3%, 4% and 5% M/V by using 500 cm3 of volumetric flask : added salt 15, 20 and 25 g into each flask ,filled in water until the volume of solution was 500 cm3, mixed them together example of salt (NaCl) solution

  12. For chemical detection we use KMnO4 solution to test quantity of bleaching agent in bean sprouts : dissolve 2 flakes of KMnO4 in 1 liter of water (=0.0677g/l)

  13. put 30 g of bean sprout in the 10 beakers of solution (including water). Vinegar 2% Vinegar 3% Vinegar 5%

  14. NaHCO3 5% NaHCO3 3% NaHCO3 4%

  15. NaCl 5% NaCl 3% NaCl 4%

  16. water

  17. waiting for 20 minutes

  18. Added KMnO4 solution 10 cm3 into the test tube mixed well and waited for 5 minutes

  19. then put away the bean sprout and put 10 cm3 of solution from each beaker into the test tube.

  20. Test the changing of the color by using spectrophotometer. Note : use 400 nm

  21. Result • Vinegar ability for washing bleaching agent in bean sprout charts

  22. Vinegar ability for washing bleaching agent in bean sprout

  23. NaCl ability for washing bleaching agent in bean sprout charts

  24. Salt ability for washing bleaching agent in bean sprout

  25. NaHCO3 ability for washing bleaching agent in bean sprout charts

  26. NaHCO3 ability for washing bleaching agent in bean sprout

  27. Discussion • From this experiment , We can see that Na2S2O4 can dissolve the best in vinegar solution because vinegar solution can decompose Na2S2O4 .(Mayer ,1992 )

  28. We can assume that the NaCl solution and NaHCO3 solution dissolve Na2S2O4 worse than vinegar solution because they have Na+ ion that dissolve in water already and it disturb the dissolving of Na2S2O4

  29. For this result ,it’s oppose with Aubrey result because he said that all of vinegar, NaHCO3 and salt are good to wash the vegetable and decompose toxic .

  30. Future research • This project will help your health by washing the bleaching agent from the bean sprout .If you want to continue this project , you can use other chemical substances to wash bleaching agent from bean sprout .

  31. Suggestion • if we have more time, we should do the experiment again for 2-3 times to make sure that we have accurate result. • Maybe we use more kinds of solution to make us know what the best cleaner solution other than we used.

  32. References • Aubrey.(2011). Vegetable Washing Tips. Retrieved August 7,2011, from http://www.ehow.com /info_8635506_home-cleaning-sprays-made- bleach.html. • Dvorak, G. (2005 ,February). Disinfection. Center for Food Security and Public Health. Ames, IA: Center for Food Security and Public Health, Iowa State University. p. 12. Retrieved August 7,2011, from http://www.cfsph.iastate.edu /BRM/ resources/Disinfectants/Disinfection101Feb2005.pdf. • KFDA.(2009).Find sodium hydrosulfite at GFS Chemicals. Retrieved August 16,2011, • from http://www.chemindustry.com/chemicals/0523798.html. • Weinrach, J. B.; Meyer, D. R.; Guy, J. T.; Michalski, P. E.; Carter, K. L.; Grubisha, D. S.; Bennett, D. W. (1992). A structural study of sodium dithionite and its ephemeral dihydrate. Retrieved August 16,2011, from http://en.wiki • pedia.org/wiki/Sodium_dithionite. • Wiebold,D.(2007). Brief Introduction of Mung Bean. Retrieved August 8,2011, from • http://en.wikipedia.org/wiki/Mung bean.

  33. QUESTION& ANSWER

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