Determination Total Dissolved Solids (TDS) in water sample

 

Inorganic / Analytical Chemistry Practical

• Aim: Determination total dissolved solids in water sample

• Procedure: Take 100 ml beaker and clean up chromic acid and acetone and complete dry. Cool the beaker and weight it. Not the reading as w1.  
•                  Now pipette out 25 ml. water sample and transfer it in the above clean and dry beaker. Evaporate to dryness either on a sand bath or in an oven at 105 C. Cool the beaker and weight it and note the reading as W₂.   

• Calculation

W1 = weight of empty beaker

 W2= weight of beaker with total dissolved solid    

   TDS = W2 – W1  =   A   g in 25 ml. of water

                            = A × 1000 = B mg. in 25 ml. of water

 25 ml. water contain = B mg. TDS

1000 ml. water contain = ?

                                      = B x 1000

                                              25

                                      = C mg. in 1000 ml.    OR

                                      = C ppm.

                                         

• Result

1.      Total dissolved solid in water sample = C ppm