# Answered Essay: Help with these Sapling Problems, Thanks! The Acid HA (Ka = 3.6 x 10-4) equilibrates between water

Help with these Sapling Problems, Thanks!

The Acid HA (Ka = 3.6 x 10-4) equilibrates between water and ether.

1. Write out the distribution coefficient (D) and the partition coefficient (K) equations for this system. (Hint: I am just look for what going on in each phase for each equation. No calculations should be done).

2. Calculate D at pH 4.00 if K = 50.

3. If 50 mL of 0.010 M HA are extracted with 100 mL ether, what will be the concentration of HA remaining in the aqueous phase at pH 2.50? At pH 8.50?

4. Will D be greater or less at pH 3.50 than at pH 4.00? Explain why.

1.Ans.

Partition coefficient is the ratio of only concentration of unionized specis.

Distribution coefficient is the ratio of concentratipon of un-ionized and ionized species.

Ether is very less soluble in water.

Partition co-efficient =[C2H6] / [H2O]

Distribution co-efficient = [ether]unionized + [ether]ionized  / [water]ionized + [water]unionized

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