As a Chemistry teacher at Holy Trinity High School and a former Glenmuir High Student myself, I try to impart my love for the subject to my students.
One such opportunity arose when I mentioned the reaction of sulphide salts, specifically Zinc (II) Sulphide (ZnS(s)) with Hydrochloric acid (HCL(aq)), which produces Hydrogen Sulphide (H2S(aq))as shown in the reaction equation below.
ZnS(s) + 2HCL(aq) → ZnCl2(aq) + H2S(aq)
This is similar to the reaction equation of Magnesium Oxide (MgO(s)) salts with Hydrochloric Acid(HCL(aq)), but instead of producing H2S(aq) it produces Water (H2O(g)).
MgO(s)+ 2HCL(aq) → MgCl2(aq) + H2o(aq)
Both Oxygen and Sulphur are in Group VI in the periodic table, but whereas CO turns a solution of Calcium Carbonate (CaCO3(aq)) or slaked lime milky white, one produces an offending odour.
This also presents the chance for a great prank, that being a stinkbomb. However, be careful, as H2S(aq) is explosive in large concentrations, so keep the stink bomb as small as possible!
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