You are assigned the following diprotic acid And will complete a Microsoft Excel

Question

You are assigned the following diprotic acid And will complete a Microsoft Excel spreadsheet with the following columns: Column 1 (the x-axis) - pH by every 0.5 units beginning with zero. Column 2: [H_3 O^+] Column 3: alpha_0 Column 4: alpha_1 Column 5: alpha_2 Column 6: H^+ ratio from 1.00 - 0.00 (14-pH)/14 Column 7: OH ratio from 0.00 - 1.00 pH/14 Step 1: Write the K_1 and K_2 acid dissociation equilibrium expression for a standard diprotic acid. (1) H_2A + H_2O Doubleheadarrow HA + H_3 O^+ K_1 = (2) HA + H_2O Doubleheadarrow A^2- + H_3O^+ K_2 = Step 2: Rearrange K_1 and solve for [HA^-] = and rearrange K2 and solve for [A^2-] = Finally, for [A^2-] = express this equation only in terms of [H_2 A], in other words, substitute what the [HA^-] equaled at K_1 in place of the symbol [HA^-] for the equation [A^2-]__[A^2-] =

Explanation / Answer

Step 1 : Dissociation constant expressions,

(1) K1 = [HA-][H3O+]/[H2A]

(2) K2 = [A^2-][H3O+]/[HA-]

Step 2 : [HA-] = K1[H2A]/[H3O+]

[A^2-] = K2[HA-]/[H3O+]

Finally,

[A^2-] = K1K2[H2A]/[H3O+]^2

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