Styles Text Box- 5 for the experiment. KHT (s) ?K+(aq) + HT (ag) Kanzm Pre-Labor

Question

Styles Text Box- 5 for the experiment. KHT (s) ?K+(aq) + HT (ag) Kanzm Pre-Laboratory Problems 1. Write the reaction for the dissociation of KHT(s) in water. Write the equilibrium expression for the dissociation of KHT in water. 3. 2. Develop an ICE Chart for the dissociation of KHT in water. 4. Why is it important to add enough KHT to the KCl NaCl solution in this lab to ensure solid remains? Titration of a Saturated Potassium Hydrogen Tartrate (KHT) Solution Against Standardized NaOH Elg) Print Layout View T sec 11 Pa 2

Explanation / Answer

1. KHT dissociation equation,

KHT(s) ---> K+(aq) + HT-(aq)

2. equilibrium expression,

Keq = [K+][HT-]

3. ICE chart of KHT in water

     KHT(s) + H2O ---> K+ + HT- + H2O

I      x              -            -        -           -

C    -y             -            +y    +y          -

E    x-y           -              y       y

4. K+ is commin ion in both KHT and KCl, therefore adding KHT to a KCl-NaCl mixture reduces solubility of KHT in solution according to the common ion effect. Thus, excess KHT is added to push the equilibrium of KHT dissociation towards K+ and HT- end and produce a saturated solution while still having some amount of KHT remained in solution.

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