Equipment:
- Sample of filtered water
- Beaker
- Oven
Experiment:
- Find mass of clean dry beaker
- Place 100 cm³ water in beaker and evaporate in oven
- Find mass of cool beaker + dissolved solids
- By subtraction, calculate mass of dissolved solids
Calculating Total Dissolved Solids in p.p.m.
Lets take mass of dissolved solids as 1.5g/100 cm³
Total Dissolved Solids: 1.5g/100 cm³ = 15g/L
Total Dissolved Solids (p.p.m.) = 15 x 1000 = 15000 p.p.m
Possible Questions
1. Why is it necessary to use filtered water?
If unfiltered water is used, we do not get an accurate measure of the total dissolved solids. We get a measure of total dissolved solids + total suspended solids.
