Consider the following four titrations (a-d): a. 100 mL of 0.1 MNH_3(K_b = 1.8 t

Question

Consider the following four titrations (a-d): a. 100 mL of 0.1 MNH_3(K_b = 1.8 times 10^-5) by 0.1 MHCI b. 100 mL of 0.1 MHCI by 0.1 MNaOH c. 100 mL of 0.1 MHOCI (K_a = 3.5 times 10^-8) by 0.1 MNaOH d. 100 mL of 0.1 MHF(K_a = 7.2 times 10^-4) by 0.1 MNaOH Rank the four titrations in order of increasing pH at the halfway point to equivalence (lowest to highest pH). Use the letters a, b, c. and d to represent the various titrations. Rank the four titrations in order of increasing pH at the equivalence point. Use the letters a, b, c. and d to represent the various titrations. Which tritration requires the largest volume of titrant (HCI or NaOH) to each the equivalence point? (Enter "note" if no titration requires more than the others.)

Explanation / Answer

For the given four solutions,

Part 1. Ranking of solutions on the basic of pH at half-way to the equivalence point

d < b < c < a

Part 2. Ranking of solutions in order of increasing pH at equivalence point

a < b < d < c

Part 3. Solution that required largest volume of titrant to reach equivalence point

none

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