Question

When salt and water are combined, they form a salt or saline solution. How much ml of water must be added to 150 mL of an 80% saline solution to produce a 30% saline solution?

Answer 1

We must add 400 ml of water.

Explanation:

We can use the following equation:

`C_(i)V_(i)=C_(f)V_(f)`

Where:

• C(i) is the initial concentration of the solution (80%)
• C(f) is the final concentration of the solution (30%)
• V(i) is the initial volume (150 ml)
• V(f) is the final volume

Now, we just need to solve the equation for V(f).

`V_(f)=(C_(i)V_(i))/(C_(f))`

`V_(f)=(80*150)/(30)`

`V_(f)=400\: ml`

Therefore, we must add 400 ml of water.

I hope it helps you!