Suppose we start with 3.0g of contaminated benzoic acid. After recrystallisation we end up with 2.3g of pure benzoic acid. What is the percentage recovery of the experiment?
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Suppose we start with 3.0g of contaminated benzoic acid. After recrystallisation we end up with 2.3g of pure benzoic acid. What is the percentage recovery of the experiment?
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- If we start with 5.2 g of Benzoic acid, calculate the minimum amount of acid to fully protonate benzoate assuming 90% yield Materials needed for experiment: 7.0 grams of toluene 6.5 mL of 30% sodium hydroxide 60.0 mL of 1M sulfuric acid 19.0 grams potassium permanganateIf the solubility of a compound A in ether is 30g/100 ml, and the solubility of A in water is 15 g /100 ml. a) If 100 ml of aqueous solution of 3g of A are extracted twice with 100 ml ether. How much A total is extracted? b) How much A would be extracted if only one extraction, but with a volume of 200 ml of ether were extracted? c) What is your conclusion from the amount of A extracted in problems a and b above?$4/34) 2. Reduction of ethyl acetoacetate with sodium borohydride (3:38-5:32). a. In setting up the reaction described in the video you add 0.127 mL of ethyl acetoacetate, 5 mL of ethanol and 74 mg of sodium borohydride. Question #1: Which compound is the limiting reagent in this reaction? Question #2: What is the theoretical yield in this reaction? Question #3: What is the % yield if you isolated 89 mg of product?
- Benzyl alcohol (0.500 mmol) and benzoic acid (0.500 mmol) were produced from the reaction of benzaldehyde and sodium hydroxide. Calculate the mass (g) of benzaldehyde needed for this reaction.A student reacted 0.500 g of triphenylmethyl bromide and 20.0 mL of water in 10 mL of acetone. The crude product was collected and dissolved in 35 ml of hot isopropanol. The hot solution was transferred immediately to an ice bath, then vacuum filtered. a) 0.024 g of purified solid was collected. What was the percent yield? b) state two specific reasons for the student's low yield based on the described procedure above.Use the following atomic weights and quantities to calculate the overall % yield of 2,2'-binaphthol. Remember that your yield must be based on the limiting reagent, and that grams must be converted to moles. Filling out most of the chart will help. Give only two significant digits in your answer.. If after rounding the answer is a whole number, do not include a decimal point. C = 12, H = 1, Cu = 63.5, N = 14, 0 = 16 formula formula weight milliliters density grams moles Answer: cupric nitrate water pyridine 2-naphthol methanol ->>> 42.063 0.831 3.158 1 0.982 4.863 1.220 0.792 % yield 2,2'-binaphthol 4.491 ?
- How would each of the following errors affect the experimental value of your molarity of acetic? Would your Molarity value be too high, too low, or unaffected? Explain your answer. if you titrated your acid sample to a bright pink rather than faint pink endpoint? if your "acetic acid" buret was still wet inside with deionized water when you filled it with acetic acid? if you recorded the final volume of NaOH as "39.88 mL" instead of "38.88 mL"?1-propanol, 2-propanol, and 1-butanol all have boiling too close together to be separated using the simple distillation column. What equipment be used to separate a mixture of these three?Use the following atomic weights and quantities to calculate the overall % yield of 4-chlorocarbonyl-4'-pentyllbiphenyl. Remember that your yield must be based on the stoichiometry (balance the reaction!), the limiting reagent, and that grams must be converted to moles. Filling out most of the chart will help. Give only two significant digits in your answer. If after rounding the answer is a whole number, do not include a decimal point. C = 12, H = 1, CI = 35.5, N = 14, O = 16, S = 32 formula formula weight milliliters density 4-carboxy-4'-pentylbiphenylthionyl chloride dimethylformamide → 4-chlorocarbonyl-4'-pentylbiphenyl 3.678 1.64 6.860 0.944 grams moles 13.314 7.117 Answer: % yield ?
- A student mixes 42.7 mL of acetone (58.08 g/mol, 0.791 g/mL) with excess benzaldehyde and NaOH to produce 79.1 g of (1E,4E)-1,5-diphenylpenta-1,4-dien- 3-one (234.29 g/mol). What is the percent yield of this student's experiment? Your Answer:What is the theoretical yield and limiting reagent for the reaction of benzophenone with sodium borohydride to form diphenyl methanol as described in the experiment provided if you begin with 1.75g of benzophenone in 25 mL of 95% ethanol and add 0.75 g of sodium borohydride portion wise over 45 minutes?The question is: A student preforms a crystallization on an impure sample of biphenyl. The sample weighs 0.5g and contains about 5% impurity. Based on his knowledge of solubility, the student decides to use benzene as the solvent. After crystallization, the crystals are dried and the final weight is found to be 0.02g. Assume that all steps in the crystallization are performed correctly, there are no spills, and the student lost very little solid on any glassware or in any of the transfers. Why is the recovery so low? I know it’s becsuse the benzene wasn’t a good choice for the solvent but I can’t explain why. Thank you!