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Answer :
Final answer:
To calculate the amount of magnesium sulfate that should be added to the PN, we need to find the total amount of magnesium sulfate already present in the PN and subtract it from the desired amount.
Explanation:
To calculate the amount of magnesium sulfate that should be added to the PN, we need to find the total amount of magnesium sulfate already present in the PN and subtract it from the desired amount. In this case, the pharmacy received an order for 10 mEq of magnesium sulfate. We can use the given information to calculate the total amount of magnesium sulfate already present in the PN:
Magnesium sulfate (4 mEq/mL) is present in a concentration of 4 mEq per milliliter. The total volume of the PN solution is 980 mL. Therefore, the total amount of magnesium sulfate already present in the PN is:
Total amount of magnesium sulfate = concentration x volume
Total amount of magnesium sulfate = 4 mEq/mL x 980 mL
Total amount of magnesium sulfate = 3920 mEq
Now, we need to subtract this total amount from the desired amount of 10 mEq:
Amount of magnesium sulfate to be added = Desired amount - Total amount already present
Amount of magnesium sulfate to be added = 10 mEq - 3920 mEq
Amount of magnesium sulfate to be added = -3910 mEq
Since we cannot have a negative amount of magnesium sulfate, it means that there is already more magnesium sulfate in the PN than needed. Therefore, no additional magnesium sulfate needs to be added.
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