Iodine tincture, which is used in medicine, is a 5% solution of crystalline iodine in ethyl alcohol.

| July 14, 2021 | education

Iodine tincture, which is used in medicine, is a 5% solution of crystalline iodine in ethyl alcohol. Calculate the volume of alcohol with a density of 0.8 g / ml that is required to prepare 250 g of such a solution.

Data: ωI – mass fraction of iodine in the considered solution (ωI = 5% = 0.05); mr-ra – the required mass of the solution (mr-ra = 250 g).

Const: ρС2Н5ОН – density of ethyl alcohol (according to the condition ρС2Н5ОН = 0.8 g / ml).

1) Mass fraction of alcohol in the considered solution: ωС2Н5ОН = 1 – ωI = 1 – 0.05 = 0.95.

2) The required mass of alcohol: mС2Н5ОН = mр-pa * ωС2Н5ОН = 250 * 0.95 = 237.5 g.

3) The required volume of alcohol: VС2Н5ОН = mС2Н5ОН / ρС2Н5ОН = 237.5 / 0.8 ≈ 297 ml.

Answer: To prepare 250 g of the solution in question, you need 297 ml of ethyl alcohol.



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