Question

calculate the mass of 0.650 % solution that can be prepared by diluting 25.9 g of 3.00 % stock solution

Answer 1

calculate the mass of 0.650 % solution that can be prepared by diluting 25.9 g of 3.00 % stock solution

Solution:

The mass concentration is calculated by the following equation: $\omega = \frac{m(\text{solution})}{m(\text{solution})} \cdot 100\%$. So, in 25.9 g of 3.00% solution there are $m(\text{solution}) = (25.9 \cdot 3) / 100 = 0.777$ g of solute. Use the mass concentration to find the mass of 0.650% solution: $m(\text{solution}) = \frac{0.777}{0.650} \cdot 100 = 119.539$ g.

Answer:

The mass of 0.650 % solution are 119.539 g.