METHYL ORANGE

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School

Medaille College *

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301

Subject

Chemistry

Date

Feb 20, 2024

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docx

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3

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1. CHEMICAL EQUATIONS, MECHANISM Mechanism 2
2. DATA: Mass of sulfanilic acid: 121.3 mg 0.1213g Moles (sulfanilic acid group): 0.1213g x (1mol/ 173.2 g/mol) = 0.00070 moles (MW Sulfanilic Acid= 173.2 g/mol) Mass of N, N-dimethylaniline: 75.5mg 0.0755g Moles of N, N-dimethylaniline: 0.0755g x (1mol/ 121.19 g/mol) = 0.000623 moles (MW = 121.19 g/mol) Mass of Methyl Orange: 0.0636g 3. RESULTS: Calculate the theoretical yield of Methyl Orange: (MW of Methyl Orange : 327.33 g/mol) Theoretical Yield: 0.00070mol x 327.33g/mol = 0.23g Calculate the % yield of purified Methyl Orange: Actual Yield: 0.0636g (0.0636g/ 0.23g) x 100 = 28% 4. DISCUSSION/ QUESTIONS: Did you produce the correct product? How do you know? Yes, we produce the correct product because at the end of the experiment, we tested a small white cloth and soaked it into our product for about 7 minutes, and after the 7 minutes, the cloth turned orange. After reaction, why is it necessary to add sodium hydroxide solution? It is necessary to add sodium hydroxide solution to produce the orange sodium salt. The excess salt decomposes to brown tar on warming to room temp. and contaminates the otherwise orange dye. If your yield was too high or too low, how do you explain that result? Our yield seems way too low. Though the yield is low, the experiment was still a success. The lower yield could have been due to excessive heat degrading the sample, excessive
impurities lost in the filtration process which can lessened the amount of the product. It could also be due other errors like the improper stirring of the solution or lack of the use of sodium chloride in washing the products. Show how the basic (orange) form of methyl orange becomes the acid form of methyl orange, showing structures and arrows to show electron pair movements. Did dying a piece of cloth work as you expected? What might be done to improve the result? Yes, it worked because after 5 min of soaking the cloth into our product, it turned orange. To improve the results, we could have heated up our product a bit more but add sodium hydroxide turned our product into an orange dye.
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