Observations HC2H3O2(aq): acetic acid 1 2 3 4 HCl(aq): 5 hydrochloric acid 6 7 NaOH(aq): 8 sodium hydroxide 9 10 CuSO4(aq): copper(II) sulfate 11 12 Distilled H 2O Tap water NaCl CuSO4 Sugar Alcohol HCl HCl HC2H3O2 HC2H3O2 NaOH NaOH --5 5 5 5 5 1 5 1 5 1 non weak strong strong non non strong strong weak weak strong strong non Answers 1. An electrolyte is a compound that, in aqueous solution, conducts electricity. As liquids: salts, bases. When aq: salts, acids, bases. 2. HCl(aq): H+(aq) + Cl –(aq) NaOH(aq): Na+(aq) + OH–(aq) CuSO4(aq): Cu2+(aq) + SO42–(aq) 3. Acid: a compound that ionizes in water to form hydrogen ions. Base: an ionic hydroxide that dissociates in water to produce hydroxide ions. 4. By placing H in front it indicates that the compound is an acid (that H comes off as H+). Answers 5. Dissociation occurs when a (ionic) compound breaks into its ions in water. Ionization occurs when a neutral atom or molecule is converted into an ion (e.g. by water). Ionic compounds and bases dissociate. Acids ionize. Dissociation H + H O + Cl + Na Cl Na + O H H Ionization + H H HO + Cl Cl H + O H H 6. HC2H3O2 is an acid; in solution it is ionized by H2O, providing ions that conduct electricity. When it’s pure, there’s no water: it can’t ionize. 7. A strong acid has a greater percentage ionization (most molecules are converted to ions). 8. The % of molecules that form ions in solution. 9. HCl was a strong acid. HC2H3O2 was weak. 10. In the lab, 1 M HCl conducted strongly, 5 M HC2H3O2 weakly. 1 M HCl had more ions. 11. HCl(aq), HNO3(aq), H2SO4(aq), HBr(aq) A = anion, M = metal 12. H2SO3: acid, KOH: base, CH3OH: other, HC3H5O2: acid, Na2C2H3O2:salt, Ba(OH)2: base For more lessons, visit www.chalkbored.com