To determine the concentration of ammonia in an aqueous solution expressed as parts per billion (ppb), we start with the formula for calculating ppb in terms of volume:
ppb = (Volume of solute in mL) / (Volume of solution in mL) × 109
In this case, we have a 2.4 liter sample of solution containing 0.012 milliliters of ammonia. First, we need to convert the volume of the solution from liters to milliliters:
Since 1 liter equals 1,000 milliliters, we can convert:
2.4 liters = 2.4 × 1,000 mL = 2,400 mL
Now, we can substitute the values into the ppb formula:
ppb = (0.012 mL) / (2,400 mL) × 109
Calculating this gives:
ppb = (0.012 / 2,400) × 109 = 5,000 ppb
Thus, the concentration of ammonia in the solution is 5,000 parts per billion (ppb).