Note that 3.5% is equal to 3.5 ml of the methanol solute over 100 ml of the water solvent.
Written as such: 3.5 solute/100 ml solvent.
We will set up 3.5 solute/100 ml solvent to equal X methanol solute/ 250 ml water solvent in order to the final numbers of ml of methanol solute needed to be added in order to make the final solution.
As for the math, it will be such:
3.5 solute/100 ml solvent = X solute/250 ml solvent
X solute = (3.5 solute/100 ml solvent) x 250 ml solvent
X solute = 8.75 ml of methanol
I hope this answer helps! If you have any more questions, feel free to message me further!
