A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by
boiling the water
adding excess calcium hydroxide
adding a calculated amount of calcium hydroxide
adding sodium carbonate
adding magnesium hydroxide
Explanation
No explanation available
Video Explanation
No video available
Post your Contribution
Discussions (44)
its D because when sodium carbonate reacts with calcium hydrogentrioxocarbonate it gives sodium hydrogentrioxocarbonate and calcium trioxocarbonate....... but when it react with calcium sulphate, calcium carbonate and sodium tetraoxosulphate is formed.... Get dat, best of luck to all jambites and God bless..
Answer D is correct it can remove temporal hardness and also permanent hardness here is the equation when(Na2CO3+Ca(HCO3) it will form NaHCO3aq +CaCO3s.
And mind u that distillation will remove both types. of hardness
D ans is 'D' bcos d sodium carbonate wil react wit d calcium sulphate 2gv an insoluble calcium carbonate dat brings d calcium ions out of d solution as precipitate.
A very very tricky question, almost went for A but had a second thought cos its only when calcium hydrogen trioxocarbonate Ca(HCO3) is dissolved in water forms temporary hardness of water which can be removed through boiling to form calcium trioxocarbonate,water & carbon dioxide.but in the question the hard water contains calcium sulphate & calcium hydrogen carbonate,from the removal of permanent hardness of water(water which contains magnesium & calcium ions) either sodiumcarbonate or sodium hydroxide can be used to remove them thereby making the water to lather with soap when in use.that's my reasons tho, I go with D
D is totally correct coz sodium carbonate also known as washing soda removes both temporary and permanent hardness in water.it causes the precipitation of trioxocarbonate Iv of calcium or magnesium when added to water that contains soluble calcium or magnesium salts.
. Adding sodium carbonate (Na2CO3): Calcium sulphate (CaSO4) and calcium carbonate (CaCO3) react with sodium carbonate to form sodium sulphate (Na2SO4) and calcium carbonate.
CaSO4 + Na2CO3 → CaCO3 + Na2SO4
Calcium carbonate can then be removed by filtration.
It's D because Sodium Carbonate is Na2C03 which is used to remove both temporary and permanent hardness of water
Washing soda (sodium carbonate) removes both temporary and permanent hardness by precipitating calcium ions as calcium carbonate
The correct ans is D. Go 2 d new school chemisti nd check 4 d removal of permanent hardness of H2O. CaSO4 in d H2O coses permanent hardness yle CaHSO4 coses temporal hardness. Both can b rmvd by option D.
How will calcium carbonate react with sodium carbonate cause they are almost of the same compound
The rite answa is D,cos d removal of permanent hardness,wich re mostly chemicals will surely remove any hardness beit temporal hardness
Sodium carbonate is suitable because when added to the water it bombards the water with carbonate ions thereby reacting with the impurities to produce insoluble precipitate
i go with 'a'..because if the boiling of the water makes the CAHCO3 to decomposes on heating and it thereby forms CACO3 which later precipitates..i disagree with 'b'..coz excess slake lime makes the water permanently hard
