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3.9 The drug streptomycin is produced on a large scale in the United States. After purification, streptomycin is 50 wt% in water. For applications, including IV drips, the streptomycin must be diluted and preservative must be added. The diluent stream contains 2 wt% NaCl in water. The preservative stream contains 10 wt% preservative and 5 wt% NaCl in water. These three streams are mixed together in a mixing tank. The outlet stream is ready for packaging in IV bags. Determine the ratio of the stream containing the drug to the outlet stream, given that the drug is 10 wt% in the outlet stream. Determine the ratio of the stream containing the preservative to the outlet stream, given that the preservative is 3 wt% in the outlet stream. Determine the ratio of the diluent stream to the outlet stream, given that the drug is 10 wt% and the preservative is 3 wt% in the outlet stream. What is the basis in this problem

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ogorwyne

Answer:

1. 1:5

2. 3:10

3. 1:2

4. conservation of mass

Explanation:

1. a:b

weight of drug in outlet stream = 10%

weight of drug in stream containing the drug = 50%

we have 10% weight of a = 50% weight in b

a:b = 10:50

= 1/5 = 0.2

2. percentage of preservative in outlet = 3%

while preservative stream contains 10%

the ratio is 3:10 = 3/10

3. from 1 and 2,

ratio of drug to outlet is 1:5

ratio of preservative to outlet stream = 3:10

to get the answer to this question

1/5+3/10

=(2+3)/10

= 5/10

= 1/2 ratio of diluent

4. the basis of calculation is conservation of mass.

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