Chemical ChangesHow It Works
Making Insoluble Salts by Precipitation
Part of Making Salts — GCSE Chemistry
This how it works covers Making Insoluble Salts by Precipitation within Making Salts for GCSE Chemistry. Revise Making Salts in Chemical Changes for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 13 in this topic. Use this how it works to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 13
Practice
20 questions
Recall
20 flashcards
⚙️ Making Insoluble Salts by Precipitation
Example: Making lead iodide (PbI₂) — a bright yellow precipitate
Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq)
Method:
- Mix solutions of lead nitrate and potassium iodide
- Yellow precipitate of lead iodide forms immediately
- Filter to collect the precipitate
- Wash with distilled water (to remove soluble impurities)
- Dry in a warm oven or between filter papers