1. Why is it important to use a saturated solution of borate ions to determine t
ID: 1041667 • Letter: 1
Question
1. Why is it important to use a saturated solution of borate ions to determine the Ksp? If the solution of borate ion is not saturated, the determined Ksp will be the same, lower, or higher than the actual. Explain. 2. In this experiment, the supernatant containing the borate ions is poured to a new dry beaker, then drops the indicator and 20 mL of water are added and the titration is starting. If the supernatant containing the borate ions is still cloudy when pipetting the 10 mL aliquots, will the calculated Ksp be the same, lower, or higher than the actual value?
Explanation / Answer
1)
It is important that the borax solution be saturated in order to achieve equilibrium between the solid and dissolved phases.If you can see solid borax crystals at the bottom of the beaker you are at equilibrium;if not you should add some additional solid borax until you can see white crystals at the bottom of the solution.
Later as you heat the solution you may need to add additional solid borax to achieve this condition.If you dont use saturated borax solution the equilibrium will not be esatblished between the phases and the value of the equilibrium constant will be high as that of actual due to less amount of reactant i.e. borax. So Ksp will be higher than actual.
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