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Water Purification Systems

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Questions and Answers

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?

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?

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?

Osmotic pressure Signup and view all the answers

Which of the following can be used to purify sea water?

Reverse osmosis Signup and view all the answers

What is the formula to calculate the soda requirement for water softening?

106/100 [permanent hardness of CaCl2 + CaSO4 + MgCl2 + MgSO4 in terms of CaCO3 equivalents] Signup and view all the answers

What is the process by which solvent molecules flow from higher concentration to lower concentration through a semi-permeable membrane?

Reverse osmosis Signup and view all the answers

Which of the following reactions produces CaCO3 and NaCl?

CaCl2 + Na2CO3 Signup and view all the answers

What is the purpose of water softening?

To remove both temporary and permanent hardness Signup and view all the answers

Which of the following is a method of water treatment?

Reverse osmosis Signup and view all the answers

Water Purification Systems

Choose a study mode

Podcast

Questions and Answers

What is the formula to calculate the lime requirement for water softening?

What is the purpose of applying pressure higher than the osmotic pressure in reverse osmosis?

Which of the following is NOT a product of the reaction between CaCl2 and Na2CO3?

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?

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?

Which of the following reactions produces CaCO3 and NaCl?

What is the purpose of water softening?

Which of the following is a method of water treatment?

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