High school11 min

Precipitation: solubility product and the Q vs Ksp test

Write a solubility product, turn it into a solubility, and decide by calculation whether a precipitate appears when two solutions are mixed.

The essentials

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Precipitate

A sparingly soluble ionic solid that forms when two ions meet in solution. To recognise: AgX++ClX−→AgCl(s)\ce{Ag+ + Cl- -> AgCl(s)} (white), BaX2++SOX4X2−→BaSOX4(s)\ce{Ba^2+ + SO4^2- -> BaSO4(s)} (white), FeX3++3 OHX−→Fe(OH)X3(s)\ce{Fe^3+ + 3 OH- -> Fe(OH)3(s)} (rust).
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Solubility product

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Solubility

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The Q vs Ksp test

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Common ion effect

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ƒWrite my own sheetOr start from a blank page: rewriting a concept in your own words is how it sticks.