To prepare a 2% arterial solution using a 25 index fluid, how much fluid is needed to make a 1-gallon solution?

To prepare a 2% arterial solution using a 25 index fluid, it is essential to understand the relationship between the desired concentration and the index of the fluid being used. The index of an arterial fluid indicates the percentage of formaldehyde present in that fluid. A 25 index fluid implies it contains 25 grams of formaldehyde per 100 milliliters.

To create a 1-gallon solution, which equals 128 ounces, the goal is to calculate the amount of 25 index fluid needed to achieve a 2% concentration in that total volume.

A 2% solution means that there are 2 grams of formaldehyde in every 100 milliliters of solution. To find out how many grams are needed for 1 gallon (128 ounces), we first convert ounces to milliliters since there are approximately 29.57 milliliters in one ounce. Thus, 128 ounces is equivalent to about 3785.41 milliliters.

To find out how many grams of formaldehyde are needed for a 2% solution, we calculate:

• 2 grams formaldehyde per 100 milliliters translates to 75.42 grams needed for 3785.41 millilit