Question

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Question 4 (1 point) Saved How many equivalents of NaOH base would you expect to add to phosphoric acid when adjusting the pH to 6.82 ? Hint: pKa values are in the notes 0.5 1.5 2.5 o 1.0 2.0 Question 6 (1 point) Citric acid is a triprotic acid with three carboxylic acid groups having pK,values of 3.1,4.8, and 64. If a solution of citric acid has a predominantly means greater then 50% pH of 5.5, what can be said about the predominant protonation state of the citric acid? hint: 1 carboxylic acid group is predominantly deprotonated, 2 are predominantly protonated 2 carboxy lie acid groups are predominantly deprotonated, I is predominantly protonated all 3 carboxylic acid groups are predominantly deprotonated all 3 carboxylic acid groups are predominantly protonated

Answer 1

p1 6.8 8o -o main tain 2 2 3.2 ng