acid formula k1 k2 k3 arsenic acid 5.8e-3 1.1e-7 3.2e-12 carbonic acid 4.45e-7 4.69e-11 hydrogen sulfide...

acid	formula	k1	k2	k3
arsenic acid		5.8e-3	1.1e-7	3.2e-12
carbonic acid		4.45e-7	4.69e-11
hydrogen sulfide		9.6e-8	1.3e-14
phosphoric acid		7.11e-3	6.32e-8	4.5e-13

Determine the pH of a 0.0410 M solution of the following salts. A table of pertinent K values is found to the right. a) Na2S b) Na3AsO4

Solutions

Expert Solution

a) pH of Na2S = 7+1/2(pka2+logC)

pka2 of Na2S = -logka2

= -log(1.3*10^-14)

= 13.89

pH of Na2S = 7+1/2(13.89+log0.0410)

= 13.25

b) pH of Na3AsO4 = 7+1/2(pka3+logC)

pka3 of Na3AsO4 = -logka3

= -log(3.2*10^-12)

= 11.5

pH of Na3AsO4 = 7+1/2(11.5+log0.0410)

= 12.056

queen_honey_blossom answered 1 year ago

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