How much sodium chloride is required to render 60 mL of a 5 % solution of neomycin sulfate isot

Step 1: Determine the concentration of neomycin sulfate in the 5% solution. Since the solution i

How much sodium chloride is required to render 60 mL of a 5...

Key Concepts

Tonicity Adjustment Calculations

Tonicity adjustment involves calculating the additional solute needed (often sodium chloride) to modify a solution's osmolarity so that it becomes isotonic with a reference solution. This process requires knowledge of the original solute contributions to the solution's osmotic pressure and the ionic properties of the additives, enabling precise determination of how much extra solute should be added to achieve the desired isotonic condition.

Weight/Volume Percentage Calculations

Weight/volume percentage (% w/v) is a method to express the concentration of a solution, indicating how many grams of a solute are present in 100 mL of solution. Understanding this concept is fundamental when preparing solutions with precise solute concentrations, as it allows for the conversion between the percent concentration and the actual mass of solute required to achieve that concentration in a given volume.

Isotonic Solutions

An isotonic solution is one that has the same osmotic pressure as another solution, typically body fluids. This concept is essential in medical and biochemical applications to ensure that cells do not shrink or swell due to water movement across cell membranes. Adjusting the tonicity of a solution often involves balancing solute concentrations so that the overall osmolarity matches that of a target isotonic standard, such as normal saline (0.9% sodium chloride).

How much sodium chloride is required to render $60 \mathrm{~mL}$ of a $5 \%$ solution of neomycin sulfate isotonic?

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