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ASPIRIN PURITY %

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ASPIRIN PURITY %

Experimental procedure

• Carefully weight 0.1-0.2 gram of solid aspirin sample into an erlenmeyer flask and note the exact amount.

• Dissolve it in 25 mL 60 % (v/v) ethanol. (Since the solubility of aspirin is very low in water, ethanol solution is used.)

• Add 1-2 drops of phenolphthalein and titrate with standardized NaOH until the pink color is observed.

(2)

Percent amount of the pure aspirin will be calculated. )

First, the moles of NaOH consumed during titration is calculated from the following equation:

According to reaction equation:

If 1 mol NaOH reacts with 1 mol Aspirin moles NaOH reacts with x mol Aspirin

The moles of aspirin found from this ratio, () is the moles of aspirin in the weighed amount. Using this mol (x), the mass of aspirin in the weighed sample can be

calculated.

The amount of pure aspirin is calculated as the % of the sample weighed.

•

Reference: Analitik Kimya Pratikleri – Kantitatif Analiz (Ed. Feyyaz ONUR), 2014

Calculation:

Referanslar

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