A solution is made of Na2SO4 and H2S. In this system you will consider only: Spe

Question

A solution is made of Na2SO4 and H2S. In this system you will consider only:

Species: H2S, HS-, S=, Na+, SO4=, H+, OH-, and H20

Reactions:

H2O = H+ + OH-

H2S = H+ + HS-

HS- = H+ + S=   

which of the following components choices are acceptable, even if they are not practical. As a reminder, these components do not have to be the considered species, they just need to follow the rules that were set for the selection of the component. Note also that, in this problem, H+ does not have to be always selected.

SO4=, H2S, Na+, OH-, H2O

Na2SO4, S=, Na2S, NaOH, H2O

S80, O20, Na0, H+, H2O

Na2SO4, SO4=, S=, Na+, H2O

Na2SO4, Na2S, H2SO4, NaOH, H2O

In your answers provide the reason why some of these selections may or may not be acceptable. In the case of acceptable solutions write the corresponding tableau showing how you can express the species on the basis set of the components proposed.

Explanation / Answer

SO4=, H2S, Na+, OH-, H2O
Na2SO4, S=, Na2S, NaOH, H2O
S80, O20, Na0, H+, H2O
Na2SO4, SO4=, S=, Na+, H2O
Na2SO4, Na2S, H2SO4, NaOH, H2O
--------------------------------------------------
of the above 4th one is correct.
From 4th one:
Na2SO4   --> 2 Na+ + SO4=

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