How much sodium chloride, in mg, is in 200 mL of NS?

Rationale

There are 1800 mg of sodium chloride in 200 mL of normal saline (NS).

Normal saline (NS) is a solution of 0.9% sodium chloride (NaCl) in water. In 200 mL of NS, the concentration of NaCl translates to 0.9 grams per 100 mL, which results in 1.8 grams or 1800 mg in 200 mL.

A (550) YOUR ANSWER

This choice represents a much lower concentration than what is present in normal saline. To reach 550 mg in 200 mL, the solution would need to be approximately 0.275%, which does not align with the standard concentration of normal saline.

B (1800) CORRECT

This is the correct amount of sodium chloride in 200 mL of NS. The 0.9% concentration means there are 0.9 grams of sodium chloride per 100 mL, leading to 1.8 grams or 1800 mg in 200 mL, confirming the standard formulation of normal saline.

C (3600) YOUR ANSWER

This option indicates a concentration of 1.8 grams per 100 mL, which would suggest a 1.8% saline solution. This is significantly higher than the 0.9% concentration of normal saline, which makes this choice incorrect.

D (5500) YOUR ANSWER

This choice represents an even higher concentration, implying a 2.75% saline solution. Such a concentration is not used in standard medical practice and far exceeds the typical formulation for normal saline, making it inaccurate.

Conclusion

Normal saline is defined by its concentration of 0.9% sodium chloride, which corresponds to 1800 mg in 200 mL. The other options reflect concentrations that do not match the standard formulation, illustrating the importance of understanding solution concentrations in medical contexts.

How much sodium chloride, in mg, is in 200 mL of NS?

There are 1800 mg of sodium chloride in 200 mL of normal saline (NS).

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