What is the balanced cell reaction for the following echem cell set-up? Pt(s) /
ID: 757309 • Letter: W
Question
What is the balanced cell reaction for the following echem cell set-up? Pt(s) / PbO2(s) / Pb(NO3)2, HNO3 // Cr(NO3)3 / Cr(s)Explanation / Answer
Pt(s) l NO(g) l NO3-(aq), H+(aq) ll SO42-(aq), H+(aq) l PbO2(s) l PbSO4(s) l Pt(s) Cr(OH)3 +3 HNO3 --> 1Cr(NO3)3 (aq) & 3 H2O =============== Why does the Cr(OH)3 dissolve, when we know that it is very insoluble, (Ksp = 1.6e-30) actually it disappears into solution by "dissociation", & by being converted into a new material that is soluble: because H+ remove the OH- ions forming water, the solid Cr(OH)3 "dissociates" into Cr+3 ions & OH- ions,... to replace the OH- in solution that the acid destroyed. HNO3 removes the OH- as fast as the Cr(OH)3 attempts to replace them, until all of the Cr(OH)3 has "dissociated". & the remaining product will be Cr(NO3)3, which is very soluble in water
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