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Please answer and exaplain ALL 4 parts! Thank you! A 3.00 mL aliquot of 0.001 M...

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Chemistry

Please answer and exaplain ALL 4 parts! Thank you!

A 3.00 mL aliquot of 0.001 M NaSCN is diluted to 25.0 mL with0.2 M Fe(NO3)3 and 0.1 M HNO3.

1. How many moles of SCN- are present?

2. If all of the SCN- is complexed with Fe3+ to form FeNCS2+,what is the molar concentration of FeNCS2+?

3. For preparing a set of standard solutions of FeNCS2+, theequilibrium molar concentration of FeNCS2+ is assumed to equal theinitial molar concentration of the SCN- in the reaction mixture.Why is this assumption valid?

4. The blank solution used to calibrate a spectrophotometer is10.0 mL of 0.2 M Fe(NO3)3 diluted to 25.0 mL with 0.1 M HNO3. Whyis this solution preferred to simply using de-ionized water for thecalibration?

Answer & Explanation Solved by verified expert
3.6 Ratings (556 Votes)
Molarity number of moles X 1000volume number of moles of SCN 0 001X3 1000 3 X10 6 moles in the 25 ml of solution 2 SCN Fe3 FeNCS2 1 mole SCN produces 1 mole of FeNCS2    See Answer
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