Tejas posted an Question
September 20, 2020 • 23:04 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Among na2co3 and nahco3 which is more water soluble ? and why?

Among Na2CO3 and NaHCO3 which is more water soluble ?

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    Priyanshu kumar best-answer

    Na2Co3 is less soluble

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    Why?

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    yes tejas typing 😊

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    According to the Born-Landé equation, the lattice energy is proportional to Z+Z-. Therefore in Na2 CO3 the Z+Z- value is 2 where as in NaHCO3 the value of Z+Z- value is one. So the lattice energy is higher in Na2 C03 than NaHCO3. In addition to that the size of bicarbonate ion is higher than carbonate. Therefore packing efficiency will be higher in sodium carbonate than sodium bicarbonate. Thus more energy will require to disrupt Na2 CO3 than NaHCO3. Therefore Na2CO3 is less soluble in water than NaHCO3.

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    sir, why u are not consider Hydration energy?

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    lattice energy is high in case of Na2Co3

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    dominant factor

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    but if Ion is large then hydration energy dominant..

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    here 2 factors decides solubility firstly is lattice energy and second their packing efficiency...the overall effect of na2co3 dominates over hydration energy

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    👆

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    tejas overall effect dominant

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    many exceptions arises...you can't proceed by taking general case

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    OK sir, there is dimerisation in case of (HCO3)1- , so solubility of nahco3 decrease, so too many factors arises.. and so this makes confusion...

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    My suggestion for periodic trends part that you make your own notes by considering exceptions and general case so that you can learn it effectively further

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    yes sir thanks 🙏

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