Question

A pad bath for flame retardant finishing is prepared by mixing 300 g/L diammonium phosphate (DAP) aqueous solution with 60 g/L softener solution in the ratio of 2:1 (v/v). The concentration (g/L) of DAP in the resultant solution (in integer) is ________________.

Hint:

To calculate the concentration of a component in a mixture, use the weighted average method based on the volumes of each component in the mixture.

Answer 1

Correct Answer: 200

The total volume of the mixture is given by the sum of the volumes of DAP solution and softener solution. The volume of DAP solution and softener solution is mixed in a ratio of 2:1. Therefore, the amount of DAP in the mixture is: \[ \text{Concentration of DAP in mixture} = \frac{\text{Amount of DAP solution}}{\text{Total volume of mixture}}. \] Substitute the values: \[ \text{Concentration of DAP} = \frac{300 \, \text{g/L} \times 2}{2 + 1} = 200 \, \text{g/L}. \] Final Answer: \[ \boxed{200}. \]