Experiment 5-Data and Analysis Data D) I. Preparation Solution Color 1. Color of

Question

Experiment 5-Data and Analysis Data D) I. Preparation Solution Color 1. Color of reactant solutions a. Color of 1 Miron(I) nitrate (Fe(NOsos) solution b. Color of 1 Mammonium thioctanate (NHsscN) solution 2. Color of stock solution (Fe(NOs3 NH4SCN) IL Temperature change effects Trial needed) Trial 1 Solution Color 1. Warm-water bath TOC) Solution Color TCC) a. 5 minutes b. 10 minutes c. 15 minutes 2. Cold-water bath Tcco Solution Color a. 5 minutes 2 k b, 10 minutes Ac dark dav k rewd c, 15 minutes III. Reactant or product concentration change effects Solution Color After Addition Precipitate Color Before Addition 2. 1 MNH SCN dark read black itut 3. 0.1 M SnCl2 non 4. 0.1 MAgNo, dark read read white 5. 1 MM NaCI 6. 0.5 M NaOH alaklee non 7. 1 M Na2HPO4 dark reed Solution Color IV. Serial Dilution 1. Stock solution 2. 1:2 dilution of stock solution 3. 1:4 dilution of stock solution -light pe 4. 1:8 dilution of stock solution 5. 1:16 dilution of stock solution

Explanation / Answer

I) Fe(NO3)3 + NH4SCN< => Fe(SCN)6 + NO3 + NH4

2) reaction is exothermic. Raising the temperature will favour the endothermic direction, equilibrium shifts to the left and the mixture becomes light coloured.
3) Lowering the temperature will favour the exothermic direction and the equilibrium shifts to the right (becomes darker)

4) Equilibria shift with concentration change

1) no change

2) shift towards right

3) shift towards left

Sn+2 + 2 Fe+3 ---------->Sn+4 + 2 Fe+2

4) Ag+ + NCS- ----------------> AgNCS

5) shift towards left

6) shift towards left

7) shift towards left

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