You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used?
I think the answer is 3.75 by dividing 750/20 but I am not sure
It makes no sense, unless the 20x means the stock solution was diluted 20 times, which would have been 1 Part stock, 19 parts water.
one part then would have been 75ml.
thank
To find out how much stock was used in the 750ml solution made from a 20X stock, you need to set up a proportion.
The term "20X stock" means that the stock solution is 20 times more concentrated than the final solution.
Let's call the amount of stock used as "x." Since the stock solution is 20 times more concentrated, the final solution will be 1/20th of the volume of the stock solution used.
Therefore, you can set up the following proportion:
x (stock used) / 20x (stock solution) = 750ml (final solution) / 1
Now, cross-multiply and solve for x:
x = (750ml * 20x) / 1
x = 15000mlx / 1
To simplify the equation, divide both sides by "x":
1 = 15000ml / x
Now, isolate "x" by multiplying both sides by "x":
x = 15000ml
So, the answer is 15000ml.
Therefore, you used 15000ml or 15 liters (since 1 liter = 1000ml) of stock to make the 750ml solution.