2015, Question 4 · Short answer · 4 points · about 9 minutes
Calcium hydroxide solubility
Calculate solubility with a common ion and complete a particle diagram showing how water molecules surround ions.
Lessons this question draws on
1 Read the question
The question is College Board's, from the 2015 exam. It starts on page 11 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 November 11, 2025.
Open Question 4 (PDF, page 11)
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 10) 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.