Consider the following four titrations (i–iv):

a. Rank the four titrations in order of increasing pH at the halfway point to equivalence (lowest to highest pH). 

b. Rank the four titrations in order of increasing pH at the equivalence point. 

c. Which titration requires the largest volume of titrant (HCl or NaOH) to reach the equivalence point?

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i. 150 mL of 0.2 M NH3 (K₂ = 1.8 × 10-5) by 0.2 M HCI ii. 150 mL of 0.2 M HCl by 0.2 M NaOH iii. 150 mL of 0.2 M HOCI (K₁ = 3.5 x 10-8) by 0.2 M NaOH iv. 150 mL of 0.2 MHF (K₁ = 7.2 Xx 10-4) by 0.2 M NaOH