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If the excess acetic anhydride is not removed in the reaction vessel an unwanted reaction will occur. The acetic anhydride will react causing esterification.

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Q: What would happen if the excess acetic anhydride is not removed in the reaction vessel?
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In the aspirin synthesis excess acetic anhydride is hydrolyzed by the addition of water which converts the anhydride into acetic acid Write the balanced equation for this reaction?

The reaction is: (CH3CO)2O + H2O = 2 CH3COOH

What is the product of the reaction between 4-aminophenol and excess acetic anhydride? follow this link to a pdf file this gives the whole information of synthesis of paracetamol from 4-aminophenol and acetic anhydride.

How do you create tri chloro acetic acid from acetic acid?

By the reaction with NaOH and excess Cl2

If 1.5g of salicylic acid is heated with an excess of acetic anhydride, what is the theoretical yield of acetylsalicyclic acid?

With 1,5 g of salicylic acid you can obtain theoretically 1,96 g aspirin (acetylsalicylic acid); but in the laboratory (or industry) I remember that the true yield of reaction is a little more than 90 %.

Suppose 5.0 g of salicylic acid is heated with an excess amount of acetic acid. What is the expected yield of acetylsalicylic acid?

This reaction will not proceed, as the equilibrium is far to the left. In order to synthesize acetylsalicylic acid, one must use acetic anhydrate, and the reaction forms acetic acid instead of water.

How is excess acetic acid removed from the reaction mixture prior to distillation in Fischer Esterification?

Add NaHCO3. NaHCO3 + CH3COOH -> Na(+)CH3COO(-) +H2O + CO2. Now the acid is in the aq layer. Remember to vent the sep funnel frequently. CO2 build up is no joke :))

Why is a large excess of acetic acid used in the preparation of isopentyl acetate?

Esterification of an acetic acid with isopentyl alcohol can can be used to prepare isopentyl acetate because the equilibria would not favor the formation of the ester, so equilibira will shift to the right IF we use excess amount of one of the reagents (acetic acid). We used large amounts of acetic acid because it's less expensive and it's easier to remove from a reaction mixture than isopropyl alcohol.

Aspirin is made by the reaction of salicylic acid with acetic an hydride what is the theoretical yield of aspirin if 85.0 grams of salicylic acid is treated with excess acetic an hydride?

Since salicylic acid is being reacted with excess acetic anhydride, salicylic acid is the limiting reactant of the reaction. The balanced equation of the reaction of salicylic acid and acetic anhydride indicates that their is a 1:1:1:1 ratio between every reactant and product. Based on this, it can be concluded that the moles of salicylic acid, if reacted entirely, will yield an equivalent amount of moles of aspirin. To find the theoretical yield, you must know the molecular weight of aspirin and salicylic acid. First, the amount of moles of salicylic acid must be calculated by dividing the gram amount of salicylic acid, which is 85 grams, and dividing it by its molecular weight, which is 138.12 grams per mole.85.0/138.12= 0.615 moles of salicylic acidThis is the mole amount of salicylic acid as well as the theoretical mole amount of aspirin. To convert the mole amount of aspirin into grams, this figure be multiplied by the molecular weight of aspirin, which is 180.15980.615 x 180.1598 = 111 grams of aspirin (when rounded to 3 significant figures)

How will excess magnesium be removed from sulphuric acid during experiment'?

you can add more H2SO4 to complete the reaction you can add water and then by filtration

How do you separate unused zinc after reacting excess zinc with dilute sulphuric acid?

When excess zinc metal is used in a reaction, it can be removed by simple filtration, as long as the particles are big enough. If the zinc particles are too small to be removed by filtration, other techniques such as centrifugation must be employed.

A neutralization reaction is what kind of a reaction?

An acid-base reaction that leaves no excess H+ or OH-

What kind reaction is a neutralization reaction?

An acid-base reaction that leaves no excess H+ or OH-