A chemistry student wants to analyze a sample of wastewater from a local factory. They want to know the concentration of the pollutants from the wastewater before releasing it into the environment. The sample is collected in a 500 mL container. After performing the required tests, the student determines that the total dissolved solids (TDS) in the sample are 750 mg/L, and the concentration of NaCl in the sample is 150 mg/L. Calculate the mass of TDS and NaCl in the sample.

Question

A chemistry student wants to analyze a sample of wastewater from a local factory. They want to know the concentration of the pollutants from the wastewater before releasing it into the environment. The sample is collected in a 500 mL container. After performing the required tests, the student determines that the total dissolved solids (TDS) in the sample are 750 mg/L, a

Answer 1

To calculate the mass of TDS and NaCl in the sample, we need to use the given concentrations and the volume of the sample.The volume of the sample is 500 mL, which is equivalent to 0.5 L  since 1 L = 1000 mL .First, let's calculate the mass of TDS in the sample:TDS concentration = 750 mg/LVolume of the sample = 0.5 LMass of TDS = TDS concentration  Volume of the sampleMass of TDS = 750 mg/L  0.5 LMass of TDS = 375 mgNow, let's calculate the mass of NaCl in the sample:NaCl concentration = 150 mg/LVolume of the sample = 0.5 LMass of NaCl = NaCl concentration  Volume of the sampleMass of NaCl = 150 mg/L  0.5 LMass of NaCl = 75 mgSo, the mass of TDS in the sample is 375 mg, and the mass of NaCl in the sample is 75 mg.