Which of the following substance do not show continuous solubility curve ?
Correct answer: B. Na2SO4. 10H2O
- A. KCIO4
- B. Na2SO4. 10H2O
- C. K2Cr2O7
- D. PbCl2
Explanation
Na2SO4·10H2O shows a discontinuity in its solubility curve because the decahydrate changes to another solid form at a transition temperature. Students may choose K2Cr2O7 because its curve changes steeply, but steepness does not mean discontinuity.
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About Solubility Product
The solubility product constant, Ksp, represents the equilibrium concentrations of ions from a sparingly soluble salt, each raised to its stoichiometric power. Problems involve writing Ksp expressions, calculating molar solubility, applying the common-ion effect and predicting precipitation from the ionic product.
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