Using data from Table 8.1 and from Section 8.3, explain why H₂ is evolved when powdered Ag is heated with a concentrated solution of HI.

Data from Table 8.1

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Table 8.1 Selected standard reduction potentials (at 298 K); further data are listed in Appen- dix 11. The concentration of each substance in aqueous solution is 1 mol dm3 and the pressure of a gaseous component is 1 bar (10 Pa). Note that where the half-cell contains [OH], the value of Eº refers to [OH] = 1 mol dm³, and the notation Eº [OH-]=1 should be used (see Box 8.1). Reduction half-equation Lit (aq) +eLi(s) K+ (aq) + eK(s) 2+ Ca²+ (aq) +2e= Ca(s) Na (aq) +eNa(s) 2+ Mg²+ (aq) + 2e 3+ Al³+ (aq) + 3e 2+ Mn²+ (aq) + 2e 1²+ (aq) + 2e Fe²+ (aq) + 2e 3+ Cr³+ (aq) + Zn 3+ Fe³+ (aq) + 3e = Mg(s) Al(s) = Mn(s) Zn(s) Fe(s) Cr²+ (aq) = Fe(s) Eº or E [OH-]=1/V -3.04 -2.93 -2.87 -2.71 -2.37 -1.66 -1.19 -0.76 -0.44 -0.41 -0.04