To calculate the amount of salt needed to prepare a 10% salt water solution in 200mL, we can follow these steps:
1. Calculate the mass of the solution:
Density of the salt water solution = 1.2 kg/L
Volume of the solution = 200 mL = 0.2 L
Mass of the solution = Density x Volume = 1.2 kg/L x 0.2 L = 0.24 kg
2. Calculate the mass of salt in the solution:
Percentage of salt = 10%
Mass of salt = Percentage of salt x Mass of the solution = 0.10 x 0.24 kg = 0.024 kg
Therefore, you will need to weigh 0.024 kg (or 24 grams) of salt to prepare a 10% salt water solution in 200mL.
