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HW Lab 25 Group I - Lab 25 Group I Prelab Questions Use...

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Lab 25 Group I Prelab Questions: Use Discussion information starting p.39 1. a) Group I ions form insoluble chlorides (p.39) b) PbCl 2 is soluble in hot water while AgCl is not (p.40) 2. a) Confirming Reagent: Solid K 2 Cr 2 O 7 in a saturated solution Confirming Reaction: Pb 2+ (aq) + CrO 4 - (aq) PbCrO 4 (s) Confirming Observation: yellow solid (PbCrO 4 ) b) Confirming Reagent: HNO 3 . Confirming Reaction: Ag(NH 3 ) 2+ (aq) + Cl - (aq) + 2 H + (aq) 2 NH 4 + (aq) + AgCl(s) Confirming Observation: white solid (AgCl) 3. Reagent Solid Present Ion in Solution a. Cold dilute HCl AgCl Bi 3+ b. Hot Water AgCl Pb 2+ c. Cold dilute HCl PbCl 2 Zn 2+ d. Cold dilute HCl AgCl Fe 3+ e. Cold dilute HCl PbCl 2 Cu 2+ Report Questions: 1. Based upon what we have learned we really can’t do a good job with this. We will learn a lot more about writing Redox reactions in chapter 20 Electrochemistry. You can skip it if you like, but here goes with what we know from chapter 4 treatment: We are told elemental silver, Ag, is oxidized to Ag + by HNO 3 which must then be reduced.
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