Question

Exercises: Experiment 9 25 pts Name 1. Write the net ionic equations for the reactions which occurred when aqueous KOH was initially added to: 12 pts a. Al(NO3), (aq) b. Fe(NO3)2 (aq) 000000004AAAAAAAAA c. Ni (NO3)2 (aq) AAAAAAUUU 2. How do the results you observed when excess KOH was added illustrate the amphoteric nature of aluminum hydroxide? Explain! 5 pts 3. Refer to your results in the solubility rule experiment (Experiment 5) to predict what would happen if the initial precipitates in Part 2 were treated with sulfuric acid rather than the excess KOH. 3 pts 4. Write a balanced chemical reaction to show the reaction between sulfuric acid and KAl(OH)4 in Step 3. 5 pts

Answer 1

Net ionic equations for a reactions can be written by dissociating I the Soluble Salts into ions. after balancing it. And in the next step, Cancel the common ions present on both sides in same number. This resurts the net Tonic equation, Insoluble Substances are kept as it is without any dissociations a) AlCNO3)2 +3 KOH - ALCOH)2 +3 KNO, (5) Car] In the above except AlCOH), all other compounds are Soluble in water. So, dissociate all compounds except ALCOH). (A169 +3N03) + 3k* +04) —— Alcottis +3(k++ N03) A1+3+ 3N05* +3K+ + 301 Al(OH)3 + 3*++3M65 Net ionic equation: Al + 30H - Al(OH)3 (99) (22) (5) +3 b) Fe(NO3), + 3 KOH - Fecohz + 3 KNO, caq) (aq) * FeCOH)z is only insoluble Solid in water. All other are Soluble. fet 3+ 3 NO3 + 3(K*+01) —Fe(OH)3 +3(kt+Noz) Fest 3 + 3xos +3K+ + 36H — Fec+3Kt3r05

- The net ionic equation is, Fet3+3ot - FeCOH)3 NiC N03), + 2KOH - Ni COH)2 + 2 KNO3 . Car (aq) (5) Except NICH), all other are soluble in water Nit + 2NO3 + 3x+2017 — Ni (OH)2 + 2**+ 2NO3 Ni+2+ 206 — Nicoh), í Net ionic equalioni Ni +2+ 201 - Nicoh),