$$\ce{(i) LiHCO_3 (ii) Ca(HCO_3)_2 (iii) Zn(HCO_3)_2 (iv) AgHCO_3}$$ From my prior knowledge compounds i and ii are not solids because of the high hydration energy of Li and the high polarizing power of Ca respectively. But the answer to this question includes both options iii and iv. Which property makes them not solid/exist in solution state?
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Regarding LiHCO3, see these questions: https://chemistry.stackexchange.com/questions/73575/is-lithium-bicarbonate-an-aqueous-solution-of-lithium-carbonate .... https://chemistry.stackexchange.com/questions/69331/why-doesnt-lihco3-exist-in-solid-state/69556 – Nilay Ghosh Nov 18 '20 at 04:02
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Too bad your teacher forgot to give you his list that you can learn by heart. What a moronic multiple choice question. – Karl Nov 18 '20 at 07:59
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The only existing carbonate at the solid state is LiHCO3. – Maurice Nov 18 '20 at 09:08
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@Maurice LiHCO3 does not exist in solid state – Singularity Nov 18 '20 at 11:02
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@Singularity. The Handbook of Chemistry and Physics, 43 rd Ed, p. 597, informs that LiHCO3 is white and its solubility is 5.5 g in 100 mL water at 13°C. – Maurice Nov 18 '20 at 17:04
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@Maurice for some reason the solution to this question states all of these don't exist in solid form and some of my friends (who didn't give me a reason) implied the same. Ps- Maybe i got bad friends Xd Thanks for the help – Singularity Nov 19 '20 at 10:17
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@Singuilarity. Or maybe my Handbook was wrong. Who knows ? – Maurice Nov 19 '20 at 17:52
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@Maurice I didn't mean to imply that, sorry, i was just saying what i knew.Btw thanks for that reference book that seems quite useful for my purposes. – Singularity Nov 20 '20 at 02:23
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@Singularity. Well. The Handbook of Chemistry and Physics is a must for all students and professionals in chemistry. It has more than 2000 pages. And it is not too expensive, because it is reprinted every year, and so many people are buying it. It can also be found on the net. – Maurice Nov 20 '20 at 08:45