Given the following procedure: 1. Add 60 mg (0.060 g) of phthalic acid into a gl

Question

Given the following procedure:

1. Add 60 mg (0.060 g) of phthalic acid into a glass vial-straight wall (from microscale kit).
2. Calculate the volume of water from the data on page 80. Start with adding 0.20 ml of water; see Fig. 1.18
3. Add the water drop wise in to the tube and heat the tube using sand bath, at the same time use a boiling stick to facilitate even boiling and prevent bumping.
4. Keep adding water till the solid just dissolves.
5. Take it off from sand bath, cool it to room temperature (slow crystallization) then cool it on ice bath. You will have the mixture of solid crystals and liquid. Record the shapes of crystals.
6. Filter the crystals using Hirsch funnel.
7. Transfer the crystals to a filter paper, fold and press to dry it.
8. Weigh your crystals

Calculate the recovery (%)

Explanation / Answer

//////////////Calculate the volume of water from the data on page 80. Start with adding 0.20 ml of water; see Fig. 1.18/////////////// what does this mean??????

Weight of your crystals = Wf

Weight initial Wi = 60 mg = 0.060 g

Recovery (%) = [Wf(grams)/(0.060 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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