EXPERIMENT 24 POST-LABORATORY QUESTIONS Predict whether the following reactions

Question

EXPERIMENT 24 POST-LABORATORY QUESTIONS Predict whether the following reactions are spontaneous or not. Pd+22e-1Pd Sn+42e1Sm E 0.987 V Eo= 0.154 V Eo =-0.250 V Eo =-0.403 V Pd +2H+ Sn4 H2Sn22Ht Nit2 H2Ni + 2Ht; Nit22e-1 Cd+2 + H2Cd2H+ 2. Which of the above metals or metal ions could be oxidized in a solution Cd+2 2e-1 Cd + containing hydrogen ions? 3. a. Mark all of the ionic reactions shown above spontaneous and then identify the oxidizing and reducing agents in each. b. List the metals or metal ions according to increasing activity 236

Explanation / Answer

if H+ ions is present

then Hreference = 0V

any E° lower than that will reduce H+ to oxidize the metal

then,

Ni(s) and Cd(s) can be oxidized to form Ni2+ and Cd2+

3a.

spontanoues reaction --> must have E° >0

then

Pd+2 + H2(g) = 2H+ + Pd(s)

Sn+4 + H2(g) = 2H+ + Sn+4

also

Ni(s) + 2H+(g) = H2(g) + Ni+2(aq)

Cd(s) + 2H+(g) = H2(g) + Cd+2(aq)

b)

arrange according to activity:

Pd < Sn < Ni < Cd

least acitve, most acitive

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