Certified Wildlife Rehabilitator Practice Test

What is the ratio to prepare 100ml of 5% dextrose using 50% dextrose and sterile water?

1. 1:8

2. 1:9

3. 1:10

4. 1:7

The correct answer is: 1:9

To determine the ratio needed to prepare 100ml of a 5% dextrose solution using a 50% dextrose solution and sterile water, we start by calculating how much dextrose is needed in the final solution. A 5% dextrose solution means there are 5 grams of dextrose in 100ml. When using a 50% dextrose solution, which contains 50 grams of dextrose in 100ml, we need to find out how much of this concentrated solution will provide 5 grams of dextrose. Using the formula: \[ \text{Volume of 50% solution} = \frac{\text{Desired grams of dextrose}}{\text{Concentration of the solution}} \] Substituting in the values: \[ \text{Volume of 50% solution} = \frac{5\, \text{grams}}{50\, \text{grams/100ml}} = 10\, \text{ml} \] This means we will use 10ml of the 50% dextrose solution. To make up a total volume of 100ml, we subtract the volume of the 50% solution from the final volume