Author Question: You have 100.0 mL of 0.100 M aqueous solutions of each of the following acids: HCN, HF, HCl, and ... (Read 105 times)

bobbie · **on:** Mar 21, 2021

Question 1

You dissolve 1.25 grams of an unknown diprotic acid in 200.0 mL of H₂O. This solution is just neutralized by 5.00 mL of a 1.00 M NaOH solution. What is the molar mass of the unknown acid?

◦ 250
◦ 125
◦ 31.3
◦ 500
◦ None of these are correct.

Question 2

You have 100.0 mL of 0.100 M aqueous solutions of each of the following acids: HCN, HF, HCl, and HC₂H₃O₂. You titrate each with 0.100 M NaOH (aq). Rank the pHs of each of the solutions when each are titrated to the equivalence point, from highest to lowest pH.

	K_a for HCN = 6.2 × 10^–10
	K_a for HF = 7.2 × 10^–4
	K_a for HC₂H₃O₂ = 1.8 × 10^–5

◦ HCN, HC₂H₃O₂, HF, HCl
◦ HCl, HF, HCN, HC₂H₃O₂
◦ HF, HCN, HC₂H₃O₂, HCl
◦ HC₂H₃O₂, HCl, HCN, HF
◦ None of these are correct.

ansleighelindsey · **Reply #1 on:** Mar 21, 2021

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