Question

The solubility of sulfamethoxypyridazine (SMP) in a 10% by volume mixture of dioxane and 90% by volume of water is 1.8 mg/mL at 25°C. Calculate: Molarity

A. 0.02 mol/L
B. 0.03 mol/L
C. 0.04 mol/L
D. 0.05 mol/L

Answer 1

To calculate the molarity of sulfamethoxypyridazine (SMP) in the given mixture, we need to convert the solubility from mg/mL to mol/L using the molar mass of SMP. The molarity is approximately 0.006 mol/L.

Step-by-step explanation:

To calculate the molarity, we need to convert the solubility of sulfamethoxypyridazine (SMP) from mg/mL to mol/L. The molar mass of SMP is 311.35 g/mol. We can use the following equation:

Molarity = (Solubility in mg/mL * 1 g/1000 mg)/(Molar mass of SMP)

Plugging in the values, we get:

Molarity = (1.8 mg/mL * 1 g/1000 mg)/311.35 g/mol = 0.0058 mol/L

Therefore, the molarity of SMP in the 10% dioxane and 90% water mixture is approximately 0.006 mol/L. None of the given options (A, B, C, D) matches this value.