Hello experts, How are you doing? I need help here with this question --> 3- Pre

Question

Hello experts, How are you doing? I need help here with this question --> 3- Predict the products (if any) of the following reactions an write the molecular, complete ionic and net ionic equations for each. A) Aqueous sodium sulfide + hydrobromic acid. B) Solid iron + hydroiodic acid. C) Aqueous calcium perchlorate + aqueous potassium sulfate. Thanks

Explanation / Answer

A)Na2S (aq) + 2 HCl (aq) >> H2S (g) + 2 NaCl (aq) 2Na+ + S2- + 2H+ + 2 Cl- >> H2S + 2 Na+ + 2 Cl- S2- + 2 H+ >> H2S (g) B)Fe + 2HCl = FeCl2 + H2 Iron is a transition metal, and therefore can have various charges. If you consider the electron movement in this equation you will come out with FeCl2. there will be two molecules of hydrochloric acid, whose parts will seperate. The hydrogens will bond together to create hydrogen gas, and the two chlorides will bond with the Iron. since each Chloride has a -1 charge, and the Fe has a 2+ charge (two electrons) in its valance shell, these two electrons will each bond with one chloride. Thusly the Iron forms two bonds, one single bond to each chloride. Since its valance shell has been exhausted and there are no other unbonded elements in the equation, there is way for the iron to obtain another electron, and thusly can not be Fe 3+ (which would make iron (III) chloride).

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