How many ml of 1% solution do you need . If you need to prepare .75% solution using 1% and .5% stock solutions?
Let's assume the amount of 1% solution needed is x ml.
To prepare the .75% solution, we can use the formula:
(0.01 * x) + (0.005 * (1000 - x)) = 0.0075 * 1000
0.01x + 5 - 0.005x = 7.5
0.005x = 2.5
x = 2.5 / 0.005
x ≈ 500
Therefore, you would need approximately 500 ml of the 1% solution.