Table 6.

Gibbs free energy values and redox potentials for the reductive dechlorination of chlorobenzoic acids (at pH 0) and chlorobenzoates (at pH 7) with H₂ (gas) as electron donor^a

Reactant	Product	ΔG o	ΔG o′	E o	E o′
Pentachloro	2,3,4,5-tetrachloro	−129.6	−146.8	672	347
	2,3,4,6-tetrachlorol	−128.7	−168.4	667	458
	2,3,5,6-tetrachlorol	−126.9	-167.5	658	454
2,3,4,5-tetrachloro	2,3,4-trichloro	−124.7	-169.3	646	463
	3,4,5-trichloro	−128.0	-176.6	663	501
	2,4,5-trichloro	−128.0	-166.9	663	451
	2,3,5-trichloro	−136.5	-172.0	707	477
2,3,4,6-tetrachloro	2,3,4-trichloro	−125.6	-147.7	651	352
	2,3,6-trichloro	−124.7	-161.7	646	424
	2,4,5-trichloro	−128.9	−145.3	668	339
	2,4,6-trichloro	−126.2	−160.9	654	420
2,3,5,6-tetrachloro	2,3,5-trichloro	−130.7	−155.9	677	394
	2,3,6-trichloro	−126.5	−162.6	656	428
2,3,4-trichloro	2,3-dichloro	−121.5	−158.1	630	405
	2,4-dichloro	−125.1	−155.8	648	393
	3,4-dichloro	−135.5	−161.1	702	421
2,3,5-trichloro	2,3-dichloro	−118.2	−150.7	613	367
	3,5-dichloro	−122.3	−148.2	634	354
	2,5-dichloro	−133.3	−157.0	691	400
2,3,6-trichloro	2,3-dichloro	−122.4	−144.1	634	333
	2,6-dichloro	−126.5	−141.5	656	319
	2,5-dichloro	−119.9	−154.2	621	385
2,4,5-trichloro	2,4-dichloro	−121.8	−158.2	631	406
	2,5-dichloro	−122.3	−157.9	634	404
	3,4-dichloro	−132.2	−163.5	685	433
2,4,6-trichloro	2,4-dichloro	−124.5	−142.6	645	325
	2,6-dichloro	−118.4	−155.0	614	389
3,4,5-trichloro	3,4-dichloro	−123.7	−158.3	641	407
	3,5-dichloro	−124.8	−161.6	647	424
2,3-dichloro	2-chloro	−118.3	−145.1	613	338
	3-chloro	−131.9	−157.4	684	401
2,4-dichloro	2-chloro	−114.7	−147.4	594	350
	4-chloro	−127.2	−156.1	659	395
2,5-dichloro	2-chloro	−114.2	−147.6	592	351
	3-chloro	−127.8	−159.9	662	415
2,6-dichloro	2-chloro	−120.8	−135.0	626	285
3,4-dichloro	3-chloro	−117.9	−154.4	611	386
	4-chloro	−116.8	−150.8	605	368
3,5-dichloro	3-chloro	−116.8	−151.1	605	369
2-chloro	Benzoic acid/benzoate	−121.6	−154.1	630	385
3-chloro	Benzoic acid/benzoate	−108.0	−141.8	560	321
4-chloro	Benzoic acid/benzoate	−109.1	−145.4	565	339

^aStandard conditions are 25 °C; solutes at 1 M, H₂ gas at 1 atm; ΔG ^o and E ^o are for pH 0; $\mathrm{\Delta }{G}^{o\prime }$ and E ^o′ are for pH 7. ΔG values are in kJ reaction⁻¹; E values are in mV. Values are based on Tang et al. (2010) with corrections for pH 7 calculated using Eq. 4