So last class we went to the computer lab to do a lab simulation on reactions between metals and metal ions.
Here are some of the things we learned:
- Ratio of Ions in a given formula is the same as the ratio of ions in that solution.
o For example in the formula Mg(NO3)2 (aq) there are 1 Mg ion and 2 NO3 ions. In the solution shown in the lab there were 2 Mg ions and 4 NO3 ions. The solution become a multiple of the original formula.
- Metals and their metal ions have different reactivity levels.
o Mg was much more reactive than Mg+2.
§ Mg 2+ + 2e- à Mg
- When metals and metal ions reacted they lost or gained electrons.
o Mg(s) + Cu2+ (aq) à Cu(s) + Mg2+ (aq)
§ When the Cu2+ ions were almost in contact with the Mg strip, electrons were transferred. The Cu2+ (aq) gained electrons to make Cu and Mg(s) lost electrons to make Mg2+ ions.
- These reactions we observed were single replacement reactions.
o Sn(s) + Pb(NO3)2 (aq) à Pb(s) + Sn(NO3)2 (aq)-Candace