The mass fraction of iodine in the pharmacy iodine tincture is 5% as the mass of iodine and alcohol
| February 28, 2021 | education
The mass fraction of iodine in the pharmacy iodine tincture is 5% as the mass of iodine and alcohol must be taken to prepare 200 g of tincture.
Given:
m solution (I2) = 200 g
ω (I2) = 5%
To find:
m (I2) -?
m (C2H5OH) -?
Decision:
1) Calculate the mass of iodine in the pharmacy iodine tincture:
m (I2) = ω (I2) * m solution (I2) / 100% = 5% * 200/100% = 10 g;
2) Calculate the mass of alcohol in the pharmacy iodine tincture:
m (C2H5OH) = m solution (I2) – m (I2) = 200 – 10 = 190 g.
Answer: The mass of iodine in the pharmacy iodine tincture is 10 g; weight of alcohol – 190 g.
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