Electrolytes Aqueous solutions can be categorized into 3 types: non-electrolytes, strong electrolytes or weak electrolytes based on their ability to conduct electricity. A solution must have ions to conduct. Pure Water does not conduct. Aqueous solutions can be tested for conductivity which will determine the degree of ionization of the solutes. It is possible to have full or partial ionization.
An aqueous solution of H 2 SO 4 is added to aqueous Ba(OH) 2. The reaction is monitored using a conductivity tester. Predict the correct statement(s). I) Both H 2 SO 4 and Ba(OH) 2 are strong electrolytes. II) This is a neutralization reaction. III) This is a precipitation reaction. IV) The light bulb will glow at the neutralization point. A) II B) I and II C) I, II and III D) I, II, III and IVQUESTION
QUESTION If an antacid contains Al(OH) 3 it will form AlCl 3 upon neutralization of stomach acid. How many moles of Cl – ions are in mL of M AlCl 3 ? A M B M C M D M Molarity (M) = Moles solute / Liter solution
Pb(NO 3 ) 2 (aq) + NaI (aq) NaNO 3 (aq) + PbI 2 (s) How do you know the state of the products: (s) vs. (aq)? What type of reaction is it? Double Displacement & Precipitation Write a balanced equation for the reaction. 2 2
QUESTION Given the insoluble compound Al 2 (CO 3 ) 3 predict the ions and coefficients that would be necessary to complete the following net ionic equation: __ _____ + ____ _____ Al 2 (CO 3 ) 3 A.2 AlCl Na 2 CO 3 also include 6 NaCl on right B.3 Al CO 3 2– C.2 Al CO 3 2– D.2 Al 3+ 6 Cl – + 3 CO 3 2– + 6 Na +
Pb(NO 3 ) 2 (aq) + NaI (aq) NaNO 3 (aq) + PbI 2 (s) Write a balanced Net Ionic equation for the reaction. 2 2 Pb 2+ ( aq) + 2 I 1- (aq) PbI 2 (s) What are the spectator ions in the reaction? 2 Na 1+ ( aq) ; 2 NO 3 1- (aq)
QUESTION If you began a reaction with the following ions in solution (all would be written with an aq subscript) how would you represent the proper final net ionic equation? (Consult a solubility Table.) 6Na + + 2PO 4 3– + 3Fe NO 3 – A.3Na + + PO 4 3– + Fe NO 3 – No Reaction B.6Na + + 2PO 4 3– + 3Fe NO 3 – Fe 3 (PO 4 ) 2 (s)+ 6NaNO 3 C.3Na + + PO 4 3– + Fe NO 3 – Fe 3 (PO 4 ) 2 (s)+ 6 Na NO 3 – D.2PO 4 3– + 3Fe 2+ Fe 3 (PO 4 ) 2 (s)
QUESTION In a redox reaction, oxidation and reduction must both occur. Which statement provides an accurate premise of redox chemistry? A.The substance that is oxidized must be the oxidizing agent. B.The substance that is oxidized must gain electrons. C.The substance that is oxidized must have a higher oxidation number afterwards. D.The substance that is oxidized must combine with oxygen.