BE Production Engineering Semester 1 (FE First Year)University of Mumbai
Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty

Calculate the quantity of the pure lime and soda required for softening of 1,00,000 litres of water containing the following impurities in ppm. - BE Production Engineering Semester 1 (FE First Year) - Applied Chemistry 1

Login
Create free account


      Forgot password?

Question

Calculate the quantity of the pure lime and soda required for softening of 1,00,000 litres of water containing the following impurities in ppm. The purity of lime is 70% and soda is BS% Ca(HCO3) = 30.2 , Mg(HCO3) = 20.8 ,CaCI2 = 28.1 ,MgCl2 = 8.78, CaSO= 35, MgSO4 = 6.7 .

Solution

 

impurities( mg/lit) Multification fector CaC03 equivalent Mg/lif Requirement
Ca(Hco3)=30.2 `100/162` `30.2 xx 100/162 = 18.64` L
Mg(Hco3) =20.8 `100/146` `20.8 xx 100/146 = 14.24`  2L
CaCl2 = 28.1  `100/111` `28.1 xx 100/111=25.32` S
CaS04=35 `100/136` `35 xx 100/136 = 25.74` S
MgS04 = 6.7  `100/120` `6.7xx 100/120=5.58` L+S
MgCl2 = 8.7 `100/95` `8.7 xx 100/95 = 9.16` L+S

`"Lime" =74/100 [CaCO_3  "equivalent of"  Ca (HCO_3)+ 2 xx Mg (HCO_3) + MgCI_2 xx MgSO_4 ]xx ("Volume of water")/(1000) xx 100/(%"Purity").`

`=74/100 [18.64 + 2 xx 14.25 + 9.16 + 5.58] xx (100000)/1000 xx 100/70.`

= 6541.6 gms

`"Soda" = 106/100 [CaCO_3  "equivalent of " MgCI_2 + MgSO_4 + CaSO_4 ] xx "Volum of water "/1000 xx 100/(%"Purity")`

`= 106/100 [25.31 + 9.16 +25.73 + 5.58 ] xx (100000)/1000 xx 100/85`.

= 8203 .15gms.

The lime requirement is 6541.6 gms and soda requirement is 8203. 15 gms.

  Is there an error in this question or solution?

APPEARS IN

Solution Calculate the quantity of the pure lime and soda required for softening of 1,00,000 litres of water containing the following impurities in ppm. Concept: Softening of water by Hot and Cold lime Soda method and numerical problems.
S
View in app×