So I have just done this experiment and it requires me to create these solutions

Question

So I have just done this experiment and it requires me to create these solutions from blank 1 to 10 with the chemicals shown on the chart Table 34.1 Composition of the Set of Standard FeNCS2 Solutions for Preparing the Calibration Curve Standard Solution 0.001 M NaSCN 0.2 M Fe(NO33 (in 0.1 M HNO (in 0.1 M HNO 0.1 M HNO, 0.0 mL 10.0 mL 10.0 mL 10.0 mL 10.0 mL 10.0 mL 0 mL 1 mL 2 mL 3 mL 4 mL 5 mL Dilute to 25 mL 1 Dilute to 25 mL Dilute to 25 mL 13 Dilute to 25 mL 12 Dilute to 25 mL 11 Dilute to 25 mL Blank 4

Explanation / Answer

Yeah, you have done great...

THE REASON BEHIND THIS IS VERY SIMPLE.

As you are adding sodium thiocyanate solution into the ferric nitrate solution then then the Nitrate ion (NO3-) is replaced by thiocyanate ion (SCN-) grdually/slowly, solution colr getting darker. Once it reaced its final equilibrium means all Nitrate ion (NO3-) is get replaced by thiocyanate ion (SCN-), then it showed dark color. All of this dark color is due to the charge transfer transition in Fe-SCN complexes whether in Fe-nitrate complex it was absent.

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