A bottle in lab is labeled [CoCl2.6H2O] = 0.652 M in 8.433 M HCl. If you determine [CoCl42-] to be 0.129 M at a particular temperature using absorbance measurements, what must be the value of [Co(H2O)62+] in the solution at that temperature?

Explanation:

Chemical equation for the given reaction is as follows.

First, we will calculate the moles of as follows.

         = 0.652 mol

Therefore,

       = 0.129 moles of

Now, moles per liter of which will not react will be calculated as follows.

          0.652 - 0.129

         = 0.523

Thus, we can conclude that there are 0.523 moles of present per liter.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.