How to Calculate the Chloride Content in a Fluid
- 1). Draw a three-row, three-column grid on a piece of paper. Label the columns "1," "2," and "3." Label the first row "Water Drops," the second "Indicator Drops" and the third "AgNO3 Solution Drops."
- 2). Add 20 drops of water to a test tube with a micropipette. Count the drops carefully and note the amount on your grid.
- 3). Place one drop of the sodium chromate into the test tube. The solution should now be a yellow-green color.
- 4). Add the silver nitrate (AgNO3) into the test tube one drop at a time. Mix the solution after every drop. When the solution appears white it indicates silver chloride. Continue adding drops of silver nitrate to the test tube until the solution turns red. This indicates silver chromate, which forms when all the chloride is gone.
- 5). Make a note of the number of drops of silver nitrate on the paper.
- 6). Write out the equation for determining the molarity of chloride. This equation is expressed as "molarity of AgNO3 x (Drops of AgNo3/Drops of Water Sample)"
- 7). Multiply the molarity of chloride by 35,500 to convert the result in step 6 to milligrams.