Given the following procedure, 1. Add 40 mg (0.040 g) of naphthalene into a glas

Question

Given the following procedure,

1. Add 40 mg (0.040 g) of naphthalene into a glass vial-straight wall.
2. Use a pipette to add 5 drops of methanol in case of naphthalene, heat to boil using sand bath and wooden stick to stir.
3. Keep adding the respective solvent till the solid just dissolves.
4. Take it off from sand bath, cool it to room temperature then cool it on ice bath. You will have the mixture of solid crystals and liquid. Record the shape of crystals.
5. Try your best to take off the solvent using a pipette.
6. Transfer the crystals to a filter paper and weigh your crystals

Calculate the recover (%)

Explanation / Answer

Weight of your crystals = Wf

Weight initial Wi = 40 mg = 0.040 g

Recovery (%) = [Wf(grams)/(0.040 grams) ]x 100

With this you can calculate recovery % ( since you didn't gave final weight , so we can't know how exactly it comes)

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