WebPermanent hardness is due to C l ⊝ and S O 4 2 − of M g 2 + and C a 2 + and is removed by adding N a 2 C O 3 . C a S O 4 + N a 2 C O 3 → C a C O 3 + N a 2 S O 4 C a C l 2 + N a 2 C O 3 → C a C O 3 + 2 N a C l WebThis form of hardness results from the occurrence of dissolved calcium and sodium bicarbonates in the water. You can remove this water hardness by tossing in some lime or calcium hydroxide (lime softening). Permanent …
Which salt causes permanent hardness of water? - TimesMojo
WebJul 7, 2024 · Permanent hardness is due to calcium and magnesium nitrates, sulphates, and chlorides etc. This type of hardness cannot be eliminated by boiling. Does boiling water remove hardness? Since boiling removes the water’s calcium content, the result is softer water. Boiling is a quick and cheap way to fix hard water for consumption purposes. WebMay 12, 2024 · 2. Permanent hardness. This type of hardness is mainly due to calcium and magnesium sulfate and chlorides. It can not be removed by boiling and lime method. For the removal of permanent hardness water softener and ion-exchange columns are used. What is soft water (pure water) When the hardness is less than 50 mg/l it is known as soft water. canucks ads
water treatment – removing hardness (calcium and magnesium)
WebPermanent hardness is caused due to: A Magnesium carbonate B Magnesium Bicarbonate C Magnesium sulphate D All of the above Solution The correct option is D Magnesium sulphate Permanent hardness in water is hardness due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium, which will not be precipitated by boiling. WebAug 21, 2015 · Water has temporary hardness due to the presence of Ca(HCO3)2 or Mg( HCO3)2 which can easily removed by boiling or addition of lime water. However, permanent hardness is due to the presence of sulphates and chlorides of calcium and Mg. The commonly used method for softening of such water is the soda ash process but this is … WebPermanent hardness: The presence of magnesium and calcium soluble salts in the form of chlorides and sulphates in the water. It is usually not removed by the boiling process. The cause of the permanent hardness of water is dissolved chloride and sulphate ions. canucks ahl