Preparation of Standard Solution

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How to prepare a standard solution for the equilibrium constant experiment.
Reaction between Fe3+ and SCN-

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Preparation of Standard Solution

  1. 1. Preparation of Standard Solution0.0020 M KSCN0.0020 M Fe (NO3)3.9H2OMaterials needed  2 x 100 mL Standard flasks  Balance (preferably 3 decimal places)  Funnel  Clean dry small beaker (50 or 100 mL) for massing the solute (Instead of weighing boat)  Wash bottle filled with distilled water –(Distilled water placed at the south west corner of the room)Preparation of 0.0020 M KSCN / 0.0020 M Fe(NO3)3  Calculate the mass of KSCN needed for preparing 100 mL of 0.0020 M solution  Take a clean 100 mL standard flask – wash it properly no need to dry the inside  Place a 50 or 100 mL beaker on the balance and tare it  Mass the required quantity of the solute into the clean dry glass beaker (instead of a weighing boat)  Add a small quantity of distilled water and dissolve the solute in the glass beaker  Transfer the solution to a clean 100 mL standard flask using a funnel  Care should be taken while transferring, not even a single drop of the solution should be lost in the process – any questions? ask your teacher  Repeat washing of the beaker a couple of times until the solution is completely transferred.  Make sure that the amount of water used for washing does not exceed the volume of the standard beaker.  Once the transfer is complete add water to top up the solution in the standard flask up to the 100 mL mark.  Close the standard flask and mix the solution completely for uniformity.  Label the standard flask appropriately.Note: Add approximately 10 mL of 1 M HNO3 while preparing the Fe3+ solution toprevent hydrolysis of Fe3+.

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