Part A: Relative Solubilities of Group 2A Salts Observations For each combinatio

Question

Part A: Relative Solubilities of Group 2A Salts Observations For each combination of reactants mixed together, record whether or not a precipitate was observed. Also record any distinguishing characteristics of the precipitates. 1 M H2SO 1 M Acetic Acid Ba(No) PPT PPT Ca(NOs)2 Mg(NO3)2 Sr(NO)2 Lignt NO PPT NO PP1 NO PPT per PPT PPT Analysis Based on your results in the table above, list the four alkaline earth metal cations in order the solubility of the salts formed. Then clearly explain how you determined this order 1. most soluble 2. Does solubility increase or decrease going down the group? Using Periodic Properties to Identify Group 2A and Group 7A lons Page

Explanation / Answer

1) Based on the results of the experiment, the order of solubilty is as follows:

Mg2+ > Ca2+ > Sr2+ > Ba2+

This is because Mg2+ doesn't form precipitate with any solvent except a light precipitate with Na2CO3, so it is the most soluble cation among the four.

Then comes  Ca2+ which forms precipitate with two solvents

Then comes Sr2+ which forms precipitate with two solovents and a light precipitate with one solvent

Then comes Ba2+ which forms precipitate with heavy precipitates with all the solvents.

2) Solubility increases as we go down the table till Mg2+ and after Mg2+ it decreases.

  

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