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Calculate the total hardness in ppm in given water sample.: 50ml of standard hard water , containing 1mg pure CaCO3 per ml consumed 20ml EDTA solution. - Applied Chemistry 1

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Numerical

Calculate the total hardness in ppm in given water sample.
: 50ml of standard hard water , containing 1mg pure CaCO3 per ml consumed 20ml EDTA solution.
: 50ml of water sample consumed 30ml EDTA solution using EBT indicator.

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Solution

                                    1 ml SHW       =     1 mg of CaC03 eq.

                                      ∴ 50ml SHW   =     50 mg of CaC03 eq .
                                     50 ml of SHW = 20 ml of EDTA solution.
                                     20 ml of EDTA =  50 mg of CaC03 eq. 
                                    ∴ 1 ml of EDTA =  `50/20 ` mg of CaC03 eq .
                                                             = 2.5 mg of CaC03 eq. 
                       50 ml of water sample  =  30 ml of EDTA solution.

                ∴ 1000 ml of water sample   = `(1000 xx 30 ) /50`
                                                             = 600 ml of EDTA solution
                        1 ml of EDTA                =    2.5 mg of CaC03 eq. 
                ∴ 600 ml of EDTA               =  2.5x 600
                                                            = 1500 mg of CaC03 eq. 
                     ∴   Total hardness of     = 1500 mg/L
                  water sample                    = 1500ppm.

Concept: Hardness of Water
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