Understanding ppm (parts per million)
* ppm stands for parts per million. It's a way to express very low concentrations of a substance.
* 1 ppm means 1 milligram of solute dissolved in 1 kilogram of solvent (or 1 liter of water, as water has a density of 1 kg/L).
Calculations
1. Convert ppm to mg/L: 100 ppm NaCl = 100 mg NaCl / 1 L water
2. Calculate the mass of NaCl needed: Since you need to prepare 1 liter of solution, you'll need 100 mg of NaCl.
Preparation
1. Weigh out 100 mg of NaCl using a precise balance.
2. Dissolve the NaCl in a small amount of distilled water.
3. Transfer the solution to a 1-liter volumetric flask.
4. Add distilled water to the volumetric flask until the bottom of the meniscus reaches the 1-liter mark.
5. Mix the solution thoroughly to ensure homogeneity.
Important Notes:
* Use distilled or deionized water to avoid introducing impurities.
* Use a clean and dry volumetric flask for accurate measurements.
* Store the solution in a tightly sealed container to prevent evaporation and contamination.
Let me know if you'd like to prepare a different concentration or volume of the solution!
