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1. If 1000 milliliters of a certain solution contain 30 milligrams of a dye, (a) what is the volume of the tenth aliquot and (b) how many milligrams of the dye will the tenth aliquot
1000 mL solution contains 30 mg of dye
So concentration will be
= 30/1000 mg/mL
= 0.003 mg/mL
(a) And its 10th aliquot will have volume is (divide whole volume in 10 parts)
(b) 10th aliquot (100 mL) will have concentration of dye
= concentration in mg/mL X 100mL
2. A prescription balance has a sensitivity requirement of 0.006 gram. Explain how you would weigh 0.012 gram of atropine sulfate with an error not greater than 5%, using lactose as the diluent.
(i) Smallest quantity may be weighed
= 100% x Sensitivity requirement/acceptable error (%)
= 100% x 0.006 g / 5%
= 0.12 g
(ii) 0.012 g of atropine sulfate needed which is ten time less than smallest quantity to be weighed
Multiplying factor 10
=0.12 g of drug
And 0.12 x 10 will be drug + diluents
(iii) Prepare a mixture of total amount 1.2 g
Include 0.12 g of drug and 1.08 g diluents
(iv) Now mixture of 1.2 g is divided in 10 aliquot
Each part will have =0.012 g drug (Atropine sulfate) and 0.108 g of diluents (Lactose)...
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