CHM 131 Study Guide - Fall 2018, Comprehensive Midterm Notes - Ion, Acid, Hydrogen

• School: University of Rochester
• Department: Chemistry
• Course: CHM 131
• Professor: Benjamin Hafensteiner

Document Summary

Solid ionic salt crystal na+cl- is dissolved in water homogeneous mix (more states). Coulomb interactions between polar h2o and cl- ions at crystal surface. Inverse reaction (precipitation) much less likely for na+cl- and other strong electrolytes. Precipitation is more likely for (m2+)(a2-) salts, due to the greater charges and stronger coulomb interactions. A1 precipitates all four metals non-selective (useless answer) A4 precipitates only one - too selective (hit or miss, hit could be last) these are both poor choices for the first reactant to try. Halogens (f2, cl2, i2, br2) have characteristic colors as vapors or in non-polar organic solvents (e. g. , hexane). Halide ions (f-, cl-, i-, br-) are colorless in solution. 2+ (cid:4666)(cid:4667)+ (cid:1841)4 2 (cid:4666)(cid:4667) (cid:1841)4(cid:4666)(cid:4667) (cid:4666)(cid:4667) (cid:1829)(cid:1841)3 (cid:4666)(cid:4667) When a halogen reacts with its own or a different halide, it tends to gain electrons in reactions forming halide anions such as (cid:1829) and (cid:1828) .