Podcast
Questions and Answers
What is the formula to calculate the lime requirement for water softening?
What is the formula to calculate the lime requirement for water softening?
- 106/100 [permanent hardness of CaCl2 + CaSO4 + MgCl2 + MgSO4 in terms of CaCO3 equivalents]
- 74/100 [temporary hardness of Ca + 2 × temporary hardness of Mg + permanent hardness of Mg in terms of CaCO3 equivalents] (correct)
- 100/106 [permanent hardness of CaCl2 + CaSO4 + MgCl2 + MgSO4 in terms of CaCO3 equivalents]
- 100/74 [temporary hardness of Ca + 2 × temporary hardness of Mg + permanent hardness of Mg in terms of CaCO3 equivalents]
What is the purpose of applying pressure higher than the osmotic pressure in reverse osmosis?
What is the purpose of applying pressure higher than the osmotic pressure in reverse osmosis?
- To allow the solvent molecules to flow from lower concentration to higher concentration
- To prevent the entry of solvent molecules into the solution
- To facilitate the flow of solvent molecules from higher concentration to lower concentration (correct)
- To increase the osmotic pressure of the solution
Which of the following is NOT a product of the reaction between CaCl2 and Na2CO3?
Which of the following is NOT a product of the reaction between CaCl2 and Na2CO3?
- CaCO3
- CaCO4
- Na2CO3 (correct)
- NaCl
What is the minimum excess pressure required to prevent the entry of solvent molecules into the solution through a semi-permeable membrane?
What is the minimum excess pressure required to prevent the entry of solvent molecules into the solution through a semi-permeable membrane?
Which of the following can be used to purify sea water?
Which of the following can be used to purify sea water?
What is the formula to calculate the soda requirement for water softening?
What is the formula to calculate the soda requirement for water softening?
What is the process by which solvent molecules flow from higher concentration to lower concentration through a semi-permeable membrane?
What is the process by which solvent molecules flow from higher concentration to lower concentration through a semi-permeable membrane?
Which of the following reactions produces CaCO3 and NaCl?
Which of the following reactions produces CaCO3 and NaCl?
What is the purpose of water softening?
What is the purpose of water softening?
Which of the following is a method of water treatment?
Which of the following is a method of water treatment?
