a Which metal will plate out first Circle one Ag Cu both will plate out

A which metal will plate out first circle one ag cu

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a) Which metal will plate out first? (Circle one) Ag Cu both will plate out together b) It takes a current of 0.75 A running for 2.5 hours to plate out all of the metal. A total mass of 3.50 g of metal plated out. What mass of silver (Ag) plated out? mass Ag: g Ag + (aq) + e - --> Ag (s) 0.80 Cu +2 (aq) + 2e - --> Cu (s) 0.34 E o (V) 2 9
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230_W16_PREP_E4_blank p 23 E o Ag + (aq) + e - --> Ag (s) 0.80 V Fe +3 (aq) + e - --> Fe +2 (aq) 0.77 V 302) Assemble a galvanic cell Pt (s) l Fe +2 (aq) ,Fe +3 (aq) ll Ag + (aq) l Ag (s) containing 500 mL of solution in each half cell, use the following components: 250 mL of 1.0 M aqueous Fe(NO 3 ) 2 250 mL of 1.0 M aqueous Fe(NO 3 ) 3 500 mL of 1.5 M aqueous AgNO 3 KNO 3 salt bridge Pt and Ag electrodes an external circuit a) What is the Δ E of the cell? Δ E = V b) How will adding water to the iron half cell affect the potential Δ E? Δ E becomes more positive Δ E becomes more negative Δ E stays the same (Circle one answer in each box b-f) c) How will adding water to the silver half cell affect the potential Δ E? Δ E becomes more positive Δ E becomes more negative Δ E stays the same K sp AgCl = 1.8x10 -10 FeCl 2 and FeCl 3 are soluble d) How will adding NaCl (s) to the silver half cell affect the potential Δ E? Δ E becomes more positive Δ E becomes more negative Δ E stays the same e) How will changing the salt bridge to Fe(NO 3 ) 2 affect the potential Δ E? Δ E becomes more positive Δ E becomes more negative Δ E stays the same f) Which ratio of Fe +3 /Fe +2 would maximize the potential of the cell? 4:1 2:1 1:1 1:2 1:4 g) When the cell reaches equilibrium, what is the value of Q (the reaction quotient)? 8 18 Q =
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230_W16_PREP_E4_blank p 24 332) Balance the following net ionic redox reaction as directed below. Ag (s) + HS -1 (aq) + CrO 4 -2 (aq) ---> Ag 2 S (s) + Cr(OH) 3(s) a) Write out the balanced reduction half reaction in acid in its simplest form. b) Write out the balanced oxidation half reaction in acid in its simplest form. c) Write out the balanced overall reaction in base in its simplest form. 3 3 4 325) Balance the following net ionic redox reaction in base : Zn (s) + NO 3 1- (aq) --> Zn(OH) 4 -2 (aq) + NH 3(aq) a) Balanced oxidation half reaction: (in acid or base...your choice) b) Balanced reduction half reaction: (in acid or base...your choice) c) Balanced overall reaction in base 2 2 4
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230_W16_PREP_E4_blank p 25 salt bridge V Cu 2+ (1 M) Cu 2+ (0.01 M) Cu (s) Cu (s) b) The 1M Cu 2+ half cell is the (circle one): anode cathode a) electrons flow (circle one) : c) The salt bridge contains KCl. Which ion flows towards the 0.01M Cu 2+ solution? (circle one) K + Cl - d) What is the value of Δ E o ? g) What is the value of Δ E? f) What is the value of Δ G o ? e) What is the value of K for the reaction? Both electrodes initially contain 17.8 g of copper and are placed in 100 mL of Cu 2+ solution. A 1.4 amp current runs through the cell for 10 minutes. After the 10 minutes of current flow, h) what is the mass of the anode ? i) what is the [Cu +2 ] ions at the cathode ?
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