2014, Question 2 · Long answer · 10 points · about 20 minutes
Propanoic acid equilibrium and titration
Calculate a weak acid equilibrium and assess a titration procedure for finding an unknown acid concentration.
This paper allotted 90 minutes to seven questions, with suggested times of 20 minutes for each long question and 7 for each short question. The current exam has 7 free-response questions in 105 minutes. The skills these questions practice still count.
Lessons this question draws on
1 Read the question
The question is College Board's, from the 2014 exam. It starts on page 7 of the PDF. College Board no longer posts this exam, so it opens from the copy of College Board's PDF that the Internet Archive saved on July 11, 2025.
2 Write your answer
Answer each part the way you would on the exam, in full sentences, with your work shown. Your writing saves as you type.
3 Score it
Score your answer against College Board's scoring guidelines, one point at a time. Give yourself a point only when your answer says what the guideline asks for.
Scoring guidelines (PDF, page 5) What the exam readers saw (Student Performance Q&A)
Question, scoring guidelines and Chief Reader report: College Board, from the Internet Archive. The title, summary are ours.