The Solubility Produc measuring the molar solubility, s, will lead to a larger b

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The Solubility Produc measuring the molar solubility, s, will lead to a larger by their ch error in the calculation of Kp because Kp depends rounded by The energ on s-cubing the number magnifies the error account of done by int is a measur Using Le Châtelier's principle, we predicted that the solubility of calcium iodate would decrease in a soluInterionic a tion containing a common ion. Now let's think of how are not usu we might increase the solubility of calcium iodate. books, How producing a solution that contains more total cal- on solubili cium and total iodate dissolved in solution. Let's think first about the anion, lodate ion. If the calcium io anion is the conjugate base of a weak acid, we might nearly two try increasing the solubility of calcium lodate by pure water adding a strong acid such as HCl or HNO, to proto- nate the 1O, ion. This would only work if an appre ciable amount of undissociated HIO, is formed. What about HIO, called hydrogen iodate or iodic acid? Is it a strong acid (one that completely dissociates) or a weak acid that has a measurable ionization constant? weak acd tat hasa mbeaurhle Jonzadcan.comsda Bibliogre Now let's think about the cation, calcium ion. Could we find something that forms a soluble com Butler, J. N plex with calcium ion or that otherwise interacts with it, for example, forming an ion pair with calcium lon? 1.2-diols, such as ethylene glycol (1.2-ethanediol) have been reported to form soluble complexes with calcium ion. The chelating agent EDTA (see Experi- ment 29) is known to form soluble complexes in basic solution with nearly any metal ion having +2 or +3 charge. and pH 1998. Ev ionic eq Cavaleiro, A 1996, 7 the anio weak aci Finally, there is another rather unexpected possi- bility. The addition of any soluble-inert' salt (one that completely dissociates) to a solution of any slightly soluble salt will increase its solubility. This is an ion-ion interaction effect or interionic attraction effect. In this context, the added "inert salt is one in Hawkes, S. J which there is no specific chemical interaction between the ions of the inert salt and the ions of the slightly soluble salt-that is, no complexation or ion- pair formation, etc. Clark, R. w Conund A critiqu L Chem ons of the Hawkes, S 1998, 7 The calcium iodate system is ideal for study of these ion-ion interactions because calcium ion has a +2 charge; such interaction effects turn out to depend on the square of the charge. As a result, the interaction effect of a calcium ion is four times that Meites, L: P and Sol 1966, 4 of calcit of an ion with +1 charge. How does this effect operate? Adding inert ions to the solution increases the total concentration of ions, thereby increasing the ionic strength of the solution. Because ions are charged, they all interact through the attractive and repulsive forces caused Ramette, R. case stu

Explanation / Answer

Le-Chatliers Principle

If the sytem is in equilibrium state and there is sudden change in temperature,concentration,volume or pressure, then the equilibrium will shift either towards the product side or the reactant side in order to neutralize the effect of the sudden change

This is known as le-chatliers principle

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