# Calculate the percent yield of aspirin. How do you calculate percent yield of aspirin? [Facts!] 2022-10-06

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Aspirin, also known as acetylsalicylic acid, is a common over-the-counter pain reliever and anti-inflammatory medication. The percent yield of a chemical reaction refers to the amount of product that is actually obtained compared to the theoretical yield, which is the maximum amount of product that could be obtained based on the stoichiometry of the reaction. Calculating the percent yield of aspirin can help chemists understand the efficiency of the synthesis reaction and identify any potential issues that may have occurred during the synthesis process.

To calculate the percent yield of aspirin, a chemist would need to first determine the theoretical yield of the reaction. This can be done by using the balanced chemical equation for the synthesis of aspirin, which involves the reaction of salicylic acid with acetic anhydride. The balanced equation for this reaction is:

C7H6O3 + C4H6O3 -> C9H8O4 + CH3COOH

From this equation, it is clear that for every mole of salicylic acid and acetic anhydride that are used in the reaction, one mole of aspirin and one mole of acetic acid will be produced. To determine the theoretical yield of aspirin, the chemist would need to know the starting amounts of salicylic acid and acetic anhydride, as well as the molecular weight of aspirin.

Once the theoretical yield of aspirin has been determined, the chemist would then need to determine the actual yield of the synthesis reaction. This can be done by weighing the amount of aspirin that was obtained after the synthesis reaction has been completed. The actual yield of aspirin can then be expressed as a percentage of the theoretical yield by dividing the actual yield by the theoretical yield and multiplying by 100%.

For example, if a chemist conducted a synthesis reaction using 1 gram of salicylic acid and 1 gram of acetic anhydride, and obtained 0.9 grams of aspirin, the percent yield of the synthesis would be 90%. This indicates that the synthesis reaction was relatively efficient, as 90% of the theoretical yield of aspirin was obtained.

It is important to note that there are many factors that can affect the percent yield of a chemical reaction, including the purity of the starting materials, the efficiency of the reaction conditions, and the presence of any contaminants or impurities. By carefully controlling these factors and accurately measuring the starting materials and products, chemists can optimize the percent yield of a chemical reaction and maximize the efficiency of the synthesis process.

## What factors affect the yield and purity of aspirin? What affects percentage yield of aspirin? If it is below 100%, it may be because of sample loss when transferring to the weigh paper. Aspirin has a chemical formula of 2-acetoxybenzoic acid CH3COOC6H4COOH and it is synthesized from salicylic acid or 2-hydroxybenzoic acid. If the percent yield exceeds 100%, then there could be impurities in the product. What is the percent yield of the acetyl salicylic acid recovered in the experiment? The ratio of carbon dioxide to glucose is 6:1. The ice has another role to play. How does titration determine purity of aspirin? The percent yield was a low value of 31%.

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## Calculate the % yield of the reaction if 6.3 g of aspirin were obtained starting with 7.5 g of salicylic acid. Because of their high electron density, acylation of ferrocene is accomplished under milder conditions using phosphoric acid as acid catalyst. Conclusion: A total of 2. What factors affect the yield of chemical reactions? Weighing, mixing, heating, cooling, filtration, washing and drying are processes that can affect the yield and the purity of aspirin. This was due to that fact that some of the iron chloride solution leaked out of the separatory funnel during the experiment. A spectrophotometer can also be used to determine the purity, since aspirin makes a violet complex with iron and this can be measured by using a spectrophotometer.

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## How do you calculate aspirin yield? To determine percent yield, divide the actual yield by the theoretical yield and multiply by 100. If you do not add the reactants in this order, you will successfully decompose the ferrocene. Put the flask in an ice bath to hasten crystallization and increase the yield of product. What is a percent yield in chemistry? What is the purpose of the synthesis of aspirin lab? Theoretical Yield Quick Review Find the mole ratio between the reactant and the product. How do you calculate theoretical yield? Example: Start with 0.

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## Calculate the percent yield of aspirin if 4.52 grams of aspirin is produced when 4.95 grams of salicylic acid is reacted with excess acetic anhydride. The higher the percentage yield is, the more efficient the reaction. Thus, the percent error was 13. What is the synthesis of ferrocene? The theoretical yield is 5. Why acetylation of ferrocene is faster than benzene? What increases product yield? What is the purpose of adding cold water in the synthesis of aspirin? If the synthesis reaction is incomplete, the unreacted salicylic acid is present as a contaminant and we have a less than 100% yield of aspirin. What is the theoretical yield of acetylsalicylic acid? How do you find the percent yield of a titration? What Factors Affect percent yield? What factors affect the yield of aspirin? Therefore, according to the results, the aspirin obtained is relatively impure.

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## For the synthesis of aspirin, how do you calculate the percent yield if the reaction produces 4.70 grams of aspirin. The reaction, using molecular... The percent yield is the ratio of the actual yield to the theoretical yield, expressed as a percentage. Cite this page as follows: "For the synthesis of aspirin, how do you calculate the percent yield if the reaction produces 4. . Why is it important to calculate the percent yield in a chemical reaction? It is possible for the Aspirin to be converted back into salicylic acid due to hydrolysis. Answers · 6 RECOMMENDED TUTORS. Based on the empirical formula 1 the mole ratio of salicylic acid to aspirin is 1:1; therefore, to get the theoretical yield of aspirin you need to multiply the number of moles of salicylic acid by the formula mass of aspirin 180.

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## How can I calculate the percent yield of aspirin synthesis? Example: Start with 0. Thus, there was 86. So, 180 gm aspirin can be generated from 138 gm salicylic acid. A higher percent yield might signal that your product is being contaminated by water, excess reactant, or another substances. What would happen to your percent yield if the aspirin you prepared was not dried completely? Usually, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Why does Tylenol help with anxiety? When complex chemicals are synthesized by many different reactions, one step with a low percent yield can quickly cause a large waste of reactants and unnecessary expense.

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## How do you calculate the theoretical yield of aspirin synthesis? To find the percent yield and calculate a full percentage, take the decimal results from the above step and multiply it by 100. Answers · 2 Why does salt crystals dissolve in the water? Answer and Explanation: Actual yield of crude acetyl salicylic acid: 0. In a reflux reaction with aspirin, the best yield should be obtained by heating the mixture of reactants around above the solvents boiling point. An excess of acetic anhydride is used in this preparation. Industrial synthesis Industrially, ferrocene is synthesized by the reaction of iron II ethoxide with cyclopentadiene; the iron II ethoxide needed is produced by the electrochemical oxidation of metallic iron in anhydrous ethanol. So, if you manipulate the conditions to favour the product side, you increase the yield.

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## Chem 1111 Experiment 21 Add phosphoric acid 0. The theoretical yield is the maximum possible mass of a product that can be made in a chemical reaction. Why 100 yield is impossible? Reasons for this can include incomplete or competing reactions and loss of sample during recovery. One contributing factor for the low yield is that some crystals were lost during the filtration process. Why is the percentage yield of aspirin less than 100? It would be somewhere between the molar mass of aspirin 180 g and that of salicylic acid 138 g , and this will give a measure of the % purity of the given aspirin sample. Synthesis of Aspirin: Aspirin is made by using salicylic acid as a starting material and acetylating it with acetic anhydride.

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