Question 57

The percentage of sodium chloride in a normal saline solution is 0.90%.

Normal saline solution contains 0.90% sodium chloride, which is a standard concentration used in medical settings for intravenous fluids and other applications.

A) 0.09%

This option is incorrect as 0.09% is significantly lower than the typical concentration of sodium chloride found in normal saline solutions. Such a low concentration would not be effective for the intended purposes of normal saline.

B) 0.45%

While this percentage is closer to the correct concentration than option A, it is still not accurate. Normal saline specifically requires a concentration of 0.90% sodium chloride to properly maintain osmotic balance in patients.

C) 0.90%

This option is correct as normal saline is defined as a solution containing 0.90% sodium chloride. This concentration is essential for its use in medical treatments, ensuring that it is isotonic with bodily fluids.

D) 9%

This option is incorrect as 9% sodium chloride is far too concentrated for a normal saline solution. Such a high concentration would likely lead to hypertonic saline, which is used in very different medical contexts and can cause cellular dehydration.

Conclusion

The correct answer, 0.90%, accurately reflects the standard concentration of sodium chloride in normal saline solutions, making it vital for various medical applications. The other options either underestimate or overestimate the concentration, thus failing to meet the established standard for normal saline.