[ausstudent6016]

I have a solution oil that has a powdered preservative added to it, the ratio I have been given for the solution is 666.666mg of preservative powder to 1ml of oil.


The amount of preservative powder in the solution is 100gms

The preservative powder's liquid volume is .085 ml per gram

Therefore the volume of preservative powder is .85 x 100 = 85ml

The volume of oil is 65ml

The total volume of the solution is 150ml.

I must add extra oil to the solution to change the ratio to 250mg/ml

Can anyone please tell me how much oil I must add please? I have been working on this one for age but still cant figure out

[Borek]

Volume of the preservative doesn't matter.

If there are 100g of the substance, what volume of the solution do you need for the solution to be 250 mg/mL?