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The document you’ve uploaded presents a chemistry problem related to the concentration and mass percentage of salicylic acid in commercial solutions, specifically for cosmetic use.

Here’s a breakdown of the problem and tasks:

### **Data Provided:**
- **Molar mass** of salicylic acid (M) = 138.1 g·mol⁻¹
- **Density** of the commercial solution (ρ) = 4.07 kg·L⁻¹
- **Volumes used:**
  - Volume of the diluted solution (Vₐ) = 10.0 mL
  - Volume of sodium hydroxide solution (Vᵦ) = 11.8 mL
  - Concentration of sodium hydroxide (cᵦ) = 5.0 × 10⁻² mol·L⁻¹

### **Tasks:**
- **(a)** Write the preparation protocol for the diluted solution from the commercial solution.
- **(b)** Write the chemical equation for the reaction between salicylic acid (AH) and sodium hydroxide (NaOH).
- **(c)** Determine the stoichiometric relationship between the reactants (salicylic acid and sodium hydroxide).
- **(d)** Calculate the concentration (cₐ) of salicylic acid in the diluted solution and deduce the concentration (c) in the commercial solution.
- **(e)** Define and calculate the mass percentage of salicylic acid in the commercial solution. Compare it with the regulation that allows a maximum of 3% to verify if the solution can be marketed.

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Des solutions aqueuses de concentrations différentes en acide salicylique sont commercialisées pour traiter l'acné. Pour rédiger l'étiquette d'une de ces solutions, on se propose de déterminer le pourcentage massique d'acide salicylique. Données fournies : masse molaire de l'acide salicylique (M) = 138,1 g·mol⁻¹, masse volumique de la solution commerciale (ρ) = 4,07 kg·L⁻¹. On a une solution diluée à partir d'une solution commerciale et on effectue une titration avec de l'hydroxyde de sodium.

Learn how to calculate the mass percentage of salicylic acid in commercial solutions for acne treatment. This chemistry problem involves key concepts like stoichiometry, molarity, and concentration calculations. Includes step-by-step instructions to determine if the solution meets regulatory requirements.

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