Can someone pls me with number 8? ~

So we can use the equation:

where M is the concentration and V is the volume in liters.

We can then solve for how much of the stock solution we are going to put into the new solution:

Then we can solve for V_{2}:

So now we know that we need to use 150 mL of the stock solution in the new solution - and we know that the total volume of the new solution is 500 mL. So therefore the rest of the new solution should be water:

So the rest of the solution (350 mL) is water.

[content deleted] - user123802726recklesschicken

[content deleted] - user123802726recklesschicken