The object of this experiment was to observe the

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The object of this experiment was to observe the changes in equilibrium that occur when MgCl 2 , HCl, and phenolphthalein are added to the reaction between MgCl 2 and NaOH. Also, to observe the changes in equilibrium that occurs when HCl, AgNO 3 , and acetone are added to the reaction between CoCl 2 and distilled water. MgCl 2 (aq) + 2NaOH(aq) → 2NaCl(aq) + Mg(OH) 2 (s) CoCl 4 + 6H 2 O (l) → Co(H 2 O) 6 + 4Cl - (aq)
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Data Studying the Dissociation Equilibrium of Mg(OH) 2 Table 7.1: Amount of Reagents added to each well in part II of the experiment Well A-1 A-2 A-3 A-4 MgCl 2 solution 20 drops 20 drops 20 drops 20 drops NaOH solution 10 drops 10 drops 10 drops 10 drops MgCl 2 1 drop + HCl 1 drop + Phenolphthalein 1 drop 1 drop Reaction: MgCl 2 and NaOH: Wells A1 - A4 contained a white milky precipitate Well A-1 after addition of MgCl 2 : 6 drops; more precipitate formed Well A-2 after addition of HCl: added 2 drops; precipitate disintegrated Wells A-3 and A-4 after addition of phenolphthalein: solutions turned bright pink Well A-3 after being in hot water bath: solution became a lighter shade of pink Well A-4 after being in ice water bath: solution became a darker shade of pink Studying the Equilibrium of the Hexaaquacobalt (II) Complex Ion Table 7.2: Amount of reagents added to each well in part III of the experiment Well B-1 B-2
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CoCl 2 solution 25 drops Half fill Distilled water Drop wise to color change Drop wise to color change HCl 1 drop+ AgNO 3 1 drop + Acetone 1 drop+ Reaction of CoCl 2 and DI water: Wells B1 - B3 turned light pink after 4 drops Well B-1 after addition of HCl: 4 drops; turned blue Well B-1 after addition of HCl and AgNO 3 : 1 drop; precipitate forms Well B-2 after addition of acetone: 8 drops, turned blue Well B-2 after being in hot water bath: solution became a lighter blue Well B-2 after being in ice water bath: solution turned pink Results and Discussion MgCl 2 (aq) + 2NaOH(aq) → 2NaCl(aq) + Mg(OH) 2 (s) Addition of MgCl 2 : More reactant is added, equilibrium shifts to the right Addition of HCl: Counteracts the effect of NaOH, equilibrium shifts to the left Addition of phenolphthalein: Detects the presence of OH - , turns the solution pink
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Hot water bath: solution turned light pink; from this it can be determined that the reaction is exothermic; more product being added, equilibrium shifts to the left
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