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Vesnalui [34]
1 year ago
10

write the balanced net ionic equations and the corresponding equilibrium constant expressions for the stepwise dissociation of t

he diprotic acid h2seo4.
Chemistry
1 answer:
nignag [31]1 year ago
8 0

The balanced net ionic equations: H₂SeO₄(aq) ⇄ 2H+(aq) + SeO₄2-(aq)

First step of balanced chemical dissociation of selenic acid in water:

H₂SeO₄(aq) ⇄ HSeO4⁻(aq) + H⁺(aq)

H₂SeO₄(aq) + H₂O(l) ⇄ HSeO4⁻(aq) + H₃O⁺(aq).

Ka is the acid dissociation constant or equilibrium constant, which quantifies the extent of acid dissociation (in this example selenic acid) in water.

Ka1 = [HSeO4⁻]·[H⁺] / [H₂SeO₄]

or Ka1 = [HSeO4⁻]·[H₃O⁺] / [H₂SeO₄]

Second step of balanced chemical dissociation of selenic acid in water:

HSeO4⁻(aq) ⇄ H+(aq) + SeO₄2-(aq)

Ka2 = [HSeO4⁻]·[H⁺] / [SeO₄2-]; equilibrium constant for second step of dissociation of selenic acid.

More info about diprotic acid: brainly.com/question/13479490

#SPJ4

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References Use the References to access important values if needed for this question A student ran the following reaction in the
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19.27

Explanation:

Some values are corrected from correct source.Thus,

Moles of SO₂ = 8.19x10⁻² moles

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Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Concentration of SO₂ = 8.19x10² M

Concentration of O₂ = 8.10x10 M

Considering the ICE table for the equilibrium as:

                    2SO₂ (g) +    O₂ (g)     ⇔          2SO₃ (g)

t = o              8.19x10⁻²      8.19x10⁻²

t = eq                -2x                  -x                      2x

--------------------------------------------- --------------------------

neq:    8.19x10⁻² -2x       8.19x10⁻² -x                      2x

Given:  

Equilibrium concentration of  O₂ = 5.98x10⁻² M  = 8.19x10⁻² -x

Thus, x = 0.0212 M

[SO₂] = 8.19x10⁻² - 2*0.0212 = 0.0395 M

[SO₃] = 2*0.0212 = 0.0424 M

The expression for the equilibrium constant is:

K_c=\frac {[SO_3]^2}{[SO_2]^2[O_2]}  

K_c=\frac{{0.0424}^2}{{0.0395}^2\times 0.0598}  

K = 19.27

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