- 1). Find the percent of calcium in one serving of milk. This is located on the milk container's nutrition label.
- 2). Find the milligrams of calcium in the container milk. First, divide the percent from step 1 by 100. For example, milk that has 30 percent of the daily recommended calcium intake will have the value of .3 when divided by 100. Next, multiply this number by 1,000 milligrams (mg), the daily reference value of calcium according to the FDA, to get 300 mg of calcium in one serving of the milk. Multiply this by the number of servings in the entire container of milk to get the amount of calcium in the container. If our example container has two one-liter servings, it contains 600 mg of calcium.
- 3). Convert the amount of calcium from milligrams to grams. Do this by dividing the number from step 2 by 1000. The example milk container contains .6 grams of calcium.
- 4). Convert the amount of grams to moles of calcium. Do this by dividing the amount of grams found in step 3 by the molar mass of calcium, 40.08 grams per mole. There are .015 moles of calcium in our example milk container.
- 5). Divide the number of grams from step 4 by the amount of liters of the container. This is the molarity of calcium in the container. Our example milk container is .0075 molar.
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