The alkaline earth elements are in Group 2 of the Periodic Desk. On this experiment Be, Mg, Ca, Ba, and Sr can be studied. All of the alkaline earth metals are M2+ cations (Mg2+, Ca2+, and so forth.) after they mix with nonmetals in ionic compounds and after they are in aqueous resolution. The reactivity of the cations of beryllium, barium, calcium, magnesium, and strontium can be examined. The metallic cations can be reacted with water. The data can be used to rank the reactivity of the metallic cations.
If an answer containing one of these cations is blended with an answer containing an anion, the alkaline earth salt will precipitate if the compound containing these two ions is insoluble. The anions used for testing the alkaline earth cations in this experiment is OH
M(s) + H2O(l) ¾® M(OH)2(s) + H2(g)
The solubilities of the compounds of the alkaline earth cations and the anions present a easy pattern according to the order of the cations in the Periodic Desk. That’s, as we go from one finish of the alkaline earth household to the different, the solubilities of the hydroxide salts both regularly improve or lower. By figuring out the solubility developments in this experiment, the order of the alkaline earths in the Periodic Desk will be capable to be confirmed.
Pre-Lab Project
As preparation for this experiment, do the following:
® Open the prelab folder on Blackboard for this experiment and observe the directions to organize for this experiment.
® Watch the video in the folder. Use to fill in the knowledge sheet and reply the questions.
Process tailored from Slowinski, et al, Chemical Rules in the Laboratory.
Periodic Developments in Group II
Report Sheet
Identify: _____________________________ Part: _________
Teacher: ____________________________ Date: __________
Decide the Reactivity of Alkaline Earth Salts
Desk 1 – Observations of reactivity of Alkaline Earth Salts
Metallic
Describe the response with water.
Be
Mg
Ca
Sr
Ba
Order of reactivity from most reactive to least reactive:
Is the knowledge according to the order of the Group 2 elements on the Periodic Desk?
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