Thursday, August 17, 2017

organic chemistry - Why are sodium and potassium displaced from soap by calcium and magnesium ions in hard water?


Sodium and potassium are more reactive than calcium and magnesium still they get displaced. Why?





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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...