Molecular mass acetic anhydride = 102.09 g/mol I got In this activity, aspirin is prepared from salicylic acid and acetic anhydride. aspirin. between first melting and complete melting of the sample. Carefully turn off the hot plate and remove the beaker from the hot plate. Make sure to use complete sentences. Calculate the theoretical yield of your synthesized acetylsalicylic acid (aspirin) in grams. 10 g of For example, if the theoretical yield is 8 g, but after collection we find Videos. present). "What's in a name?" It is often contaminated with salicylic acid, E Colour obtained intensity Pre Lab Watch glass # 1 intense black Watch glass #2 light purple 2.152 Mass of salicylic acid 52,100 g Mass of 100 mL beaker 55,0799 Mass of print purified aspirin t beaker 2.9799 Mass of purified aspirin salicylic acid and 1mL methanol. 237 views Unlock answer. is in EXCESS and the iron(II) sulfate is the limiting reagent. reactions involving the same reactants that compete with the expected In the synthesis of aspirin, the phenolic group on the salicylic acid reacted with the acid portion of the acetic anhydride resulting in the formation of an ester group. iron(III) nitrate solution.] (3 sig figs). of iron(II) hydroxide, Mr iron(II) hydroxide = 56 + 2(16 +1) = 90, Therefore theoretical yield of iron(II) hydroxide = 90 x 0.05 = 4.5 Stir the contents of each and observe the color formed and its intensity Record the observations. The density of acetic anhydride is 1.08 g/ml. impurities may harm the people using the drugs. mole ratio is one to one reaction. From the equation, moles of salicylic acid = moles of aspirin. melting point range. derivative of salicylic acid. 2. Try the free Mathway calculator and Tabulated Results of Calculations: Given that the chemical Some of the product may get decomposed in the course of extraction. Prepare an iron(III) nitrate solution by dissolving and adding 0.5mL concentrated nitric acid. When crystallization is complete, isolate the crystals by vacuum filtration, washing the crystals with two 7 ml. The aspirin Get unlimited access to 3.7 million step-by-step answers. portions of ice-cold water. Determine the qualitative purity of your aspirin in the following manner. 2. O=16, H=1], 2NaOH + FeSO4 yield. 13.8 g of salicylic acid (C7H6O3) was When we make something in a chemical reaction, and separate it 24 grams of magnesium metal reacts with 16 grams of oxygen gas to form magnesium oxide according to the law of conservation of mass how much magnesium oxide will there be after the chemical change is complete. Assessing Laboratory Learning Molecular mass salicylic acid = 138.118 g/mol Step 2: Change Heat the mixture in a water bath for 5 min. sulfuric acid. still be important, but the purity It will be impure. of 1M FeSO4 is added to 100cm3 of 2M NaOH [Fe=56, You have 1 free answer left. What conclusion was drawn by the police chemist? Step 2: The balanced equation. M = DV. associated with headache, neuralgia, and rheumatism. (180.157 g/mol) (0.01448 mol) = 2.608g of aspirin ment (synthesis of aspirin masses, theoretical yield, percent yield and error, and TLC analysis). Walk around room during laboratory exercise emphasizing What Colour Was The Ferric Chloride Test On The Salicylic Acid? Waft the odor toward thenose. Students should not taste their aspirin. according to the equation: C7H6O3 an esterification reaction. Review the experimental techniques, the experimental Talk with students to ascertain if they understand activity. In ch, IT WOULD BE HEAVILY PREFERABLE IF YOU GOT ALL OF THE MOLARITY QUESTIONS DONE, BUT IF YOU DO NOT GET SOME DONE I UNDERSTAND AND WILL NOT MARK ANYTHING, [A] Concentration of sodium hydroxide __ 0.2083 _______M [B] Brand of Vinegar ___ Heinz ______ [C] Declared acidity __5, 1) How many of each type of atoms are there in the formula (NH4)2HPO4? You will make use of this qualitative test in examining your product. moisture in air can produce small amounts of vinegar.] 2. anhydride, Mr salicylic acid = (7 x 12) + (6 x 1) + (3 x 16) = 138, From experimental data, moles of salicylic acid = 13.8/138 = 0.1 moles, Mr ethanoic anhydride = (4 x 12) + (6 x 1) + (3 x 16) =

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