determine the combination of alkaline earth cations and test solution anions tha

Question

determine the combination of alkaline earth cations and test solution anions that produce a precipitate. Predict the chemical formulas of the observed precipitates. Use your observations to identify any periodically recurring trends in the relative solubilities of the Group 2 sulfates, carbonates, oxalates, and iodates. The observed trends in solubility should vary somewhat smoothly among the alkaline earth elements. That is, they should either increase or decrease gradually through this group. By observing these trends in solubility you should be able to confirm the ordering of these elements in the periodic table. (IT IS A DISSCUTION AND ANALYSIS QUESTION, SO SUMMARY AND EXPLANINTION PLEASE).

Explanation / Answer

Sulfates ---> SO4-2

Mg+2 + SO4-2 --> MgSO4(s)

Ca+2+ SO4-2 --> CaSO4(s)

Ba+2+ SO4-2 --> BaSO4(s)

Sr+2+ SO4-2 --> SrSO4(s)

carbonates

Mg+2 + CO3-2 --> MgCO3(s)

Ca+2+ CO3-2 --> CaCO3(s)

Ba+2+ CO3-2 --> BaCO3(s)

Sr+2+ CO3-2 --> SrCO3(s)

So keep doing this... and you will notice that all salts are not soluble for this IIA grup

also, note that as the cation increase in atomic size, i.e. molar mass, then , the solubility decreases as well

so the trend goes as:

solubility decreases as we go from top to bottom in the periodic tabl ein gruop IIA

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