Module 4: Reconstitution of Solutions - Practice Problems - Answers Using Ratio-Proportion
Problem
1.
Order: Solu-Cortef 150 mg
Linear ratio-proportion
Fraction ratioproportion
Fraction ratioproportion
250 mg : 1 mL = 150 mg : x mL
250 x = 150
x = 0.6
250mg 150mg

1mL
xmL
250mg 1mL

150mg xmL
Give 0.6 mL
250 x = 150
x = 0.6
250 x = 150
x =0.6
Give 0.6 mL
Give 0.6 mL
95 mg : 1 mL = 665 mg : x mL
95 x = 665
x=7
95mg 665mg

1mL
xmL
95mg 1mL

665mg xmL
Give 7 mL
95 x = 665
x=7
95 x = 665
x=7
Give 7 mL
Give 7 mL
5,000,000 x = 1,000,000
x = 0.2
5000000 1000000

1mL
xmL
5000000 1mL

1000000 xmL
Give 0.2 mL
5,000,000 x = 1,000,000
5,000,000 x = 1,000,000
x = 0.2
x = 0.2
Give 0.2 mL
Give 0.2 mL
400 mg : 2 mL = 250 mg : x mL
400 x = 500
x = 1.25
400mg 250mg

2mL
xmL
400mg 2mL

250mg xmL
Give 1.3 mL
400 x = 500
x = 1.25
400 x = 500
x = 1.25
Give 1.3 mL
Give 1.3 mL
Available: A vial of Solu-Cortef powder
Directions: Add 1.8mL of sterile water
to yield a solution of 250mg/mL
a. What is the order? 150 mg
b. What is the available? 250mg/mL
c.
How many mL will be administered?
0.6 mL
2.
Order: Claforan 665 mg
Available: A vial of Claforan powder
Directions: Reconstitute with 10mL of
bacteriostatic water to yield a
concentration of 95mg/mL
a. What is the order? 665 mg
b. What is the available? 95 mg/mL
c.
How many mL will be administered?
7 mL
3.
Order: Pfizerpen 1,000,000 units
5,000,000:1 mL = 1,000,000:x mL
Available: A vial of Pfizerpen powder
Directions: Add 1.6 mL of sterile water
to give a concentration of 5,000,000
units/mL
a. What is the order? 1,000,000 units
b. What is the available?
5,000,000 units/mL
c.
How many mL will be administered?
0.2 mL
4.
Order: Streptomycin 0.25g
Available: A vial of Stroptomycin
powder
Directions: Reconstitute with 9mL of
sterile water for a concentration of
400mg/2mL.
a. What is the order? 0.25g
b. What is the available? 400mg/2mL
c.
How many mL will be administered?
1.3 mL
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Problem
5.
Order: Tazicef 0.6g
Linear ratio-proportion
Fraction ratioproportion
Fraction ratioproportion
200 mg : 1 mL = 600mg : x mL
200 x = 600
x=3
200mg 600mg

1mL
xmL
200mg 1mL

600mg xmL
Give 3 mL
200 x = 600
x=3
200 x = 600
x=3
Give 3 mL
Give 3 mL
200mg 750mg

2mL
xmL
200mg 2mL

750mg xmL
200 x = 1500
x = 7.5
Give 7.5 mL
200 x = 1500
x = 7.5
Give 7.5 mL
500 mg : 2 mL = 225 mg : x mL
500 x = 450
x = 0.9
500mg 225mg

2mL
xmL
500mg 2mL

225mg xmL
Give 0.9 mL
500 x = 450
x = 0.9
500 x = 450
x = 0.9
Give 0.9 mL
Give 0.9 mL
50 mg : 0.5 mL = 200 mg : x mL
50 x = 100
x=2
50mg 200mg

0.5mL
xmL
50mg 0.5mL

200mg xmL
Give 2 mL
50 x = 100
x=2
50 x = 100
x=2
Give 2 mL
Give 2 mL
Available: A vial of Tazicef powder
Directions: Add 10 mL of sterile water.
Each mL of solution contains 200mg.
a. What is the order? 0.6g
b. What is the available? 200mg/mL
c.
How many mL will be administered?
3 mL
6.
Order: Maxipime 0.75g
Available: A vial of Maxipime powder
200 mg : 2 mL = 750 mg : x mL
200 x = 1500
x = 7.5
Give 7.5 mL
Directions: Add 2.6mL of sterile water
to yield 200mg/2mL
a. What is the order? 0.75mg
b. What is the available? 200mg/2mL
c.
How many mL will be administered?
7.5 mL
7.
Order: Cefadyl 225mg
Available: A vial of Cefadyl powder
Directions: Reconstitute with 2mL of
sterile water to yield a concentration of
500mg/2mL
a. What is the order? 225 mg
b. What is the available? 500mg/2mL
c.
How many mL will be administered?
0.9 mL
8.
Order: Zovirax 200mg
Available: A vial of Zovirax powder
Directions: Add 10mL of sterile water
to yield 50mg/0.5mL
a. What is the order? 200mg
b. What is the available?
50mg/0.5mL
c.
How many mL will be administered?
2 mL
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Problem
9.
Order: Suprax 200mg
Linear ratio-proportion
Fraction ratioproportion
Fraction ratioproportion
100 mg : 5 mL = 200 mg : x mL
100 x = 1000
x = 10
100mg 200mg

5mL
xmL
100mg 5mL

200mg xmL
Give 10 mL (2 tsp)
100 x = 1000
x = 10
100 x = 1000
x = 10
Give 10 mL (2 tsp)
Give 10 mL (2 tsp)
Available: A vial of Suprax powder
Directions: Add 70mL of sterile water.
Each teaspoon contains 100mg.
a. What is the order? 200mg
b. What is the available? 100mg/tsp
c.
How many mL will be administered?
10 mL (2 tsp)
10.
Order: Ciprofloxocin 375mg
Available: A vial of Ciprofloxocin
powder
Directions: Add 10mL of sterile water
to yield a solution of 37.5mg/mL.
a. What is the order? 375mg
37.5 mg : 1 mL = 375 mg : x mL
37.5 x = 375
x =10
37.5mg 375mg

1mL
xmL
Give 10 mL
37.5 x = 375
x =10
37.5mg 1mL

375mg xmL
37.5 x = 375
x =10
Give 10 mL
Give 10 mL
b. What is the available? 37.5mg/mL
c. How many mL will be administered?
10 mL
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