Calculating the Amount of Pure Drug

Oct 13, 2025 by windailys.com 38 views

Understanding the Problem

A doctor has ordered a 7% saline solution to be prepared. This means that the solution should contain 7% of the total weight as pure drug. The task is to calculate the amount of pure drug needed to make 95 mL of solution at this 7% strength.

Calculating the Amount of Pure Drug

To solve this problem, we need to understand the concept of percentage and how it relates to the total weight of the solution. A 7% solution means that 7 grams of pure drug are present in every 100 grams of solution.

Converting Milliliters to Grams

First, we need to convert the volume of the solution from milliliters (mL) to grams. The density of water is approximately 1 gram per milliliter (g/mL), so we can assume that the density of the solution is also approximately 1 g/mL.

95 mL of solution = 95 grams of solution

Calculating the Amount of Pure Drug

Now, we can calculate the amount of pure drug needed to make 95 mL of solution at 7% strength.

7% of 95 grams = 0.07 x 95 grams = 6.65 grams

Selecting the Correct Label

The question asks for the answer to be given as an integer or a decimal. Since the answer is 6.65 grams, we can select the correct label as follows:

6.65 g is the correct answer.

Conclusion

In conclusion, to make 95 mL of 7% saline solution, we need 6.65 grams of pure drug. This is the correct answer to the problem.

Discussion

This problem requires a basic understanding of percentage and how it relates to the total weight of a solution. It also requires the ability to convert between units of measurement, such as milliliters to grams.

Key Concepts

Percentage: a way of expressing a value as a fraction of 100
Density: the mass of a substance per unit volume
Conversion between units of measurement: converting between milliliters and grams

Real-World Applications

This problem has real-world applications in various fields, such as:

Pharmacy: calculating the amount of medication needed to make a solution
Chemistry: calculating the amount of a substance needed to make a solution
Biology: calculating the amount of a substance needed to make a solution for experiments or research

Additional Resources

For more information on percentage, density, and conversion between units of measurement, see the following resources:

Final Answer

The final answer is: 6.65 g

Understanding the Problem

Q&A

Q: What is the meaning of 7% saline solution?

A: A 7% saline solution means that the solution should contain 7 grams of pure drug in every 100 grams of solution.

Q: How do I convert milliliters to grams?

A: Since the density of water is approximately 1 gram per milliliter (g/mL), we can assume that the density of the solution is also approximately 1 g/mL. Therefore, we can convert milliliters to grams by multiplying the volume in milliliters by 1 gram per milliliter.

Q: How do I calculate the amount of pure drug needed?

A: To calculate the amount of pure drug needed, we need to multiply the total weight of the solution by the percentage of pure drug. In this case, we need to multiply 95 grams by 7% (or 0.07).

Q: What is the correct label for the answer?

A: The correct label for the answer is grams (g).

Q: What is the final answer?

A: The final answer is 6.65 g.

Real-World Applications

This problem has real-world applications in various fields, such as:

Pharmacy: calculating the amount of medication needed to make a solution
Chemistry: calculating the amount of a substance needed to make a solution
Biology: calculating the amount of a substance needed to make a solution for experiments or research

Additional Resources

For more information on percentage, density, and conversion between units of measurement, see the following resources:

Common Mistakes

Forgetting to convert milliliters to grams
Not multiplying the total weight of the solution by the percentage of pure drug
Not using the correct label for the answer

Tips and Tricks

Always check the units of measurement to ensure that they are consistent
Use a calculator to simplify calculations
Double-check the answer to ensure that it is correct

Conclusion

In conclusion, calculating the amount of pure drug needed to make a solution is a simple process that requires a basic understanding of percentage and conversion between units of measurement. By following the steps outlined in this article, you can ensure that you get the correct answer.

Final Answer

The final answer is: 6.65 g

Label for the Answer

The correct label for the answer is: g

Additional Questions

What is the meaning of 7% saline solution?
How do I convert milliliters to grams?
How do I calculate the amount of pure drug needed?
What is the correct label for the answer?
What is the final answer?

Answers

A 7% saline solution means that the solution should contain 7 grams of pure drug in every 100 grams of solution.
We can convert milliliters to grams by multiplying the volume in milliliters by 1 gram per milliliter.
To calculate the amount of pure drug needed, we need to multiply the total weight of the solution by the percentage of pure drug.
The correct label for the answer is grams (g).
The final answer is 6.65 g.