RX Potassium Chloride 3:5 solution 30ml. how many millimeters of a potassium chloride 2:5 solution do you need to prepare the order?

To calculate how many milliliters of a potassium chloride 2:5 solution you need to prepare the order, we can use the following formula:

(C1)(V1) = (C2)(V2)

Where:
C1 = concentration of the first solution (3:5)
V1 = volume of the first solution (30 ml)
C2 = concentration of the second solution (2:5)
V2 = unknown volume of the second solution

First, let's convert the concentrations 3:5 and 2:5 to decimal form:
3:5 = 3/5 = 0.6
2:5 = 2/5 = 0.4

Now, we can plug in the known values into the formula and solve for V2:

(0.6)(30 ml) = (0.4)(V2)

18 ml = 0.4V2

Divide both sides of the equation by 0.4:

18 ml / 0.4 = V2

V2 = 45 ml

Therefore, you would need 45 milliliters of a potassium chloride 2:5 solution to prepare the order.