2, effected if some undissolved Ca was allow goes from solution mass IC ass of C

Question

2, effected if some undissolved Ca was allow goes from solution mass IC ass of Co was amo uut of tvu solid mass vsases. Tw a und ca OH 2 will wot the total so the sol will thon th a ually IS. 3. The laboratory ran out of magnesium nitrate (Mg(NO32) and your partner suggests substituting magnesium acetate (Mg(CH3Co22) in steps IV.1-2 to investigate the uncommon ion effect. Do you think this is a good suggestion? Why or why not? Mot niu Acero .can or to do wiHn ions it 15 not It is much better y this win anoth Y salt bucausu Mou and No so avoid surong Alcunol utes (lontL) Acetate hydroxide (Mg(OH)2) 4. Would steps III.1-2 with a filtered saturated solution of magnesium substituted for Ca(oH)2 be a good approach for determining the Ksp of Mg(OH)? Why or why not? 5. Use the measured solubility increase of Ca(OH)2 in the presence of Mg(NO3)2 (salt effect) to correct the measured solubility decrease of Ca(oH)2 in the presence of Ca(NO3)2 (common ion effect) for the general salt effect which is also present. 193

Explanation / Answer

4) Ksp of Ca(OH)2 = 5.5*10-6

Ksp of Mg(OH)2 = 1.8*10-11

The Ksp of Mg(OH)2 is much smaller than the Ksp of Ca(OH)2. Therefore, the solubilityof Mg(OH)2 in water is extremely small and hence, the same technique of titration with an acid of known concentration will not work.

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