Question

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Write the balanced net ionic equation for the reaction of aqueous iron(l) ion reacting with H2G in acidic medium 9 Fe (a4) Without added acid, the H202 will form either OHT or O2, depending upon whether the H202 is reacting as an oxidizer or a reducer. If hydroxide ion is formed, the OH may react with some of the Fe to produce an insoluble hydroxide. Will the percent yield of the iron(Ill) compound containing a complex ion be affected by the formation of the insoluble hydroxide? Write the balanced net ionic equation for the formation of the insoluble hydroxide. Oxalic acid is added to react with any insoluble hydroxide that has formed, so that essentially all of the iron (Ill) ion will be in the desired compound. After the preparation of the bright green coordination compound, the hot saturated solution can be stored carefully in your drawer to allow the solution to cool slowly. The purity of crystals that are formed slowly is greater than the purity of crystals that are formed rapidly. Wrap a paper towel around the beaker to insulate the beaker and keep out stray light. Insulation of the beaker will allow the solution to cool more slowly. The product is more soluble at higher temperatures than at lower temperatures. Therefore, the dissolving is most likely thermic and the precipitation is most likely thermic. Once the crystals begin to precipitate, does the concomitant enthalpy change increase or decrease the rate of cooling? Explain. SYNTHESIS OF A CMPLX ION CMPD 151

Answer 1

yes it is effected since some part part of Fe+3 is converted into hydroxide.

The net reaction for formation of insoluble hydroxide is as follows:

$2Fe^{+3}+3H_{2}O_{2}\rightarrow 2Fe\left ( OH \right )_{3}$

Dissolving is endothermic and precipitation is exothermic.

Once precipitation starts the concomitant enthalpy delays the rate of cooling as energy released during precipitation can be used to dissolve the precipitate