# Are lithium bicarbonate and magnesium bicarbonate both soluble in water?

Are lithium bicarbonate and​ magnesium bicarbonate both soluble in water?

Source: JEE Mains 2017 (National Level Examination of India)

Please do cite a reputed source along with your answer. Currently I have found a line from JD Lee (Concise Inorganic Chemistry 5th ed):

• srdata.nist.gov/solubility/IUPAC/iupac.aspx this is the source behind the Wikipedia article airhuff posted. – Tyberius Apr 14 '17 at 3:48
• Unfortunately, those data are not freely traceable. When I attempt to follow the link to the source data I hit a paywall :-(. – Oscar Lanzi Jul 22 '19 at 23:48

According to this Wikipedia solubility table, lithium bicarbonate is soluble in water to $\pu{5.7 g/100mL}$ at $\pu{20^oC}$, while this Wikipedia page gives the solubility of magnesium bicarbonate as $\pu{0.077 g/100mL}$.

However, another source (found by Oscar Lanzi in his good answer), "The Solubility of Magnesium Carbonate in Aqueous Solutions of Certain electrolytes, The Journal of Physical Chemistry, Volume 7, pub. 1903, reports making two measurements of the solubility of magnesium bicarbonate and finding $\pu{3.1 g/100mL}$ and $\pu{2.0 g/100 mL}$. Note that this source is from 1903, but also that the the Wikipedia link above does not give a source for their value at all. At least one reason for the dearth of information regarding magnesium bicarbonate is that it easily decomposes and it cannot readily be isolated outside of aqueous solutions. My feeling is that the Wikipedia value seems low, and that the values reported in the Journal of Physical Chemistry seem more reasonable.

• Lithium bicarbonate is also not available was a solid. See the OP' s own citation. – Oscar Lanzi Apr 14 '17 at 23:54

I beg to differ on magnesium bicarbonate. In https://books.google.com/books?id=bCfzAAAAMAAJ&pg=PA583&lpg=PA583&dq=magnesium+bicarbonate+solubility&source=bl&ots=3c8f8q4ocI&sig=XAY4Z50JRHq3FBRe8VPZjDf10sA&hl=en&sa=X&ved=0ahUKEwj91byQ3qPTAhVCOSYKHdNuDAw4ChDoAQgcMAE#v=onepage&q=magnesium%20bicarbonate%20solubility&f=false the solubility of magnesium bicarbonate is $3.06$ g/($100$mL).

• +1 for the good find. I think the values reported in this paper make more sense than the values given by Wikipedia. Note that I modified my answer to include this source, and gave credit to you and your answer for finding it, for whatever that's worth. Again, good find. – airhuff Apr 14 '17 at 20:51

From NCERT (India) 11 page 296 under "The s-block elements":

The carbonates of lithium and magnesium decompose easily on heating to form the oxides and $\ce{CO2}$. Solid hydrogen carbonates are not formed by lithium and magnesium.

Carbonates oxygenate the body and their alkalinity neutralise acidic deposits(blockages), especially in communication between cells, serotonin to dopamine to Nuerotransmitters ! Electrolysis enhances this process which is why lithium carbonate is used to treat mental illness, but with only some success, due to many side effects of lithium metal. Lithium is poisonous to the body, and we should be using magnesium bicarbonate! It's the carbonate that's helping mental illness, not the lithium content. Magnesium is great for the body and mind, not lithium !

• I am sorry, but your answer seems not relevant to the question, and it is quite incoherent. Please edit your answer to make it more relevant to the question. – Shoubhik R Maiti Jul 23 '19 at 10:19