An order requires 500mg of Amoxicillin. The pharmacy stock is 5mg/50ml. How many ml are needed for the order?

To determine the correct amount of milliliters needed to fulfill the order of 500mg of Amoxicillin, we first need to convert the concentration of the stock solution into a more manageable form. The stock solution is provided as 5mg in 50ml.

To find out how many mg are in 1ml, we can perform a simple calculation. Dividing the 5mg by 50ml gives us a concentration of 0.1mg/ml (5mg ÷ 50ml = 0.1mg/ml).

Next, we need to see how many milliliters are required to reach the required dose of 500mg. Since we know that there are 0.1mg in every 1ml, we can set up the calculation:

500mg ÷ (0.1mg/ml) = 5000ml.

This shows that in order to obtain 500mg of Amoxicillin, you would need to administer 5000ml of the stock solution. This is why the correct answer is indeed 5000ml.