# A sample of salicylic acid?

A sample of salicylic acid weighing 1.256g and the prescribed amount of reagents are used to make aspirin.

How many millimoles of each of the following are initially in the reaction vessel?

1. Salicyclic Acid

2. Acetic Anhydride

3. Sulfuric Acid (1 drop=.05mL)

The density of acetic anhydride is 1.08 grams/mL

The density of sulfuric acid is 1.85g/mL

Can someone please work me through this problem?

You haven't stated how much Ac2O or H2SO4 you're using, so I can't give you an exact amount for those reagents, but, 1.256g salicylic acid is 9.1 mmol (1.256 / 138.12 *1000).

Typically you would use excess Ac2O (10 - 20% more than the salicylic acid) and catalytic H2SO4 (1-5% of the salicylic acid)

Multiply 9.1mmol by 1.2 and 0.05 to get the number of moles of each other reagent, then multiply moles by molecular weights to get the number of grams of each.

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How many millimoles of each of the following are initially in the reaction vessel?

1. Salicyclic Acid

2. Acetic Anhydride

3. Sulfuric Acid (1 drop=.05mL)

The density of acetic anhydride is 1.08 grams/mL

The density of sulfuric acid is 1.85g/mL

Can someone please work me through this problem?

**Answer:**You haven't stated how much Ac2O or H2SO4 you're using, so I can't give you an exact amount for those reagents, but, 1.256g salicylic acid is 9.1 mmol (1.256 / 138.12 *1000).

Typically you would use excess Ac2O (10 - 20% more than the salicylic acid) and catalytic H2SO4 (1-5% of the salicylic acid)

Multiply 9.1mmol by 1.2 and 0.05 to get the number of moles of each other reagent, then multiply moles by molecular weights to get the number of grams of each.

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