Respuesta :
Answer:
When using small volumes and low-concentration products, it is usually easier
to use the same method to calculate the amount of drug (stock) and diluent as to calculate the amount of active ingredient, since these products are not labeled in percent
Explanation:
Concentrations of the solute can be calculated using the (w/v%) and (m/v%). For 5% phenylephrine hydrochloric acid solution the solute concentration needed will be 2 grams.
What is percentage concentration?
Percentage concentration is the calculation of the weight or the mass of the with respect to the volume of the solvent and multiplied by 100. w/v% calculates the concentration based on the weight/volume percentage, whereas m/v% calculates based on mass/volume percentage.
Given,
Percentage = 5%
Volume = 40 mL
Substituting values:
w/v (%) = mass of solute(g) ÷ volume of solution (mL) × 100
5% = mass ÷ 40 × 100
mass = 5 × 40 ÷ 100
= 2 gm
Therefore, 40 ml of 5% phenylephrine HCl can be prepared by 2 gm of solute dissolved in the solution.
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