Question

q4. we need to dilute 80 cc of a 2.5 % solution to 340 cc. what is the concentration of the 340 - cc solution?

Explanation:

Step1: Find the amount of solute

The amount of solute in the original solution is calculated by multiplying the volume of the solution by its concentration. So, for 80 cc of a 2.5% solution, the amount of solute is $80\times2.5\% = 80\times0.025 = 2$ cc.

Step2: Calculate the new concentration

When we dilute the solution to 340 cc, the amount of solute remains the same (2 cc). The new concentration is the amount of solute divided by the new volume of the solution, then multiplied by 100% to get the percentage. So, the new concentration is $\frac{2}{340}\times100\% \approx 0.588\%$.

Answer:

The concentration of the 340 - cc solution is approximately $0.59\%$ (or more precisely $\approx 0.588\%$).