5 Match 93.75193.75ml193 75 mll Q: Stock solution A is 200 mM, stock solution B

Question

5 Match 93.75193.75ml193 75 mll Q: Stock solution A is 200 mM, stock solution B is 40 mM. How many millliters of stock solution A do you need to make 250 mL of 100 mM solution?-1-ml B1: 93.75193.75ml|93.75 mll 8 Match 1001100U/ml|100 U/mll 1.00 Q: Express U-100 as units per mL. 1U/ml (Use 3 sig fig) B1: 100/100U/ml| 100 U/mll 9 1001100min|100 minl Match Q: A patient recelves 20 drops per minute of 0.2 mg/ml solution by IV. How many minutes of IV infusion will it take to deliver 16 mg of drug? (1 drop = 0.04 mL) 1 min (Use 3 sig fig) B1: 1001100min| 100 min

Explanation / Answer

5. Stock solution of A = M1 = 200 mM

Molarity of A needed = M2 = 100 mM

Volume of A to be made = V2 = 250 mL

Volume of Stock solution needed = V1

Applying M1V1 = M2V2,

200 x V1 = 100 x 250

V1 = 125 mL

8. U-100 represents 100 units per mL (100 U/mL)

9. 1 drop = 0.04 mL

20 drops contain = 20 x 0.04 mL = 0.8 mL

1 mL has 0.2 mg of IV.

For 16 mg, you need 16 / 0.2 = 80 mL of IV

20 drops contain 0.8 mL of IV, so

Drops required to get 80 mL of IV = 20 x 80 / 0.8 = 2000

In 1 min, 20 drops are received by patient.

For 2000 drops, patient will need infusion for 2000 / 20 = 100 min.

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