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1.A. Suppose the weak diprotic acid, hydrogen sulfide (H2S), is titrated with KOH solution. What is...

1.A. Suppose the weak diprotic acid, hydrogen sulfide (H2S), is titrated with KOH solution. What is the charge balance equation, representing all charged species present, once the titration is started?

**I assumed it would be an acid balance with H2O as a biproduct but it still didn’t seem to get the correct score** please let me know how to properly solve this.

1.B An aqueous solution is formed by dissolving 0.20 moles of sodium sulfide (Na2SO3) in 1.0 L of water (H2SO3 is a diprotic weak acid). Write the MATERIAL BALANCE EQUATION for the solution, in the form of “F Na2SO3 = ___”

1.C Suppose that you pipette 0.992 mL of solution A (a mixture of H3PO4 and H2PO4) into a titration vial, add 1.984 mL of water, and titrate this solution with a standardized solution of 0.515 F NaOH. You observe the first equivalence point after adding 0.583 mL, and the second equivalence point after adding 1.691 mL. (What concentration of phosphoric acid (including all species) in solution A will be found?)

The formal concentration of phosphoric acid (including all species) in solution A is:_____

show all your work. - thanks!

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