Do not worry about B5. I just need help on how to calculate B2 and B4. Please sh

Question

Do not worry about B5. I just need help on how to calculate B2 and B4. Please show your steps.

R. Absorbance for the set of Test solutions S on M Molar concentration of feNOh Molar concentration of NSCN COOODM 10 Test Solutions R.I. volume of feNO), (mt) S BB.2. Moles of Fe , initial moD 2. COLL 3.com CO mLLScom B.3 volume of NaSCN (m) B. 4. Moles of SCN , initial (mo) B6Percent transmittance, ET (for meter readings only) 0.8 La13 L -75 1 O.35% B.6. Absorbance, A *Calculation for Test Solution 6.

Explanation / Answer

B2

Given that the concentration of Fe(NO3)3 is 0.002 M (It exists in water as Fe3+ and No3-)

0.002 M Fe(NO3)3 0.002 M Fe3+

Kindly note that Molarity is defined as the number of moles of solute in 1000 mL

Then number of moles of Fe3+ in 1 mL = 0.002/1000 = 0.000002 moles

Number of moles in 5 mL = 0.000002 x 5 = 0.00001 moles

B4.

Similarly 0.002 M NaSCN contains 0.002 M SCN-

Since molarity is the number of moles in 1000 mL

Number of NaSCN moles in 1 mL = 0.002/1000 = 0.000002 moles

Number of NaSCN moles in 2 mL = 0.000004 moles

Number of NaSCN moles in 3 mL = 0.000006 moles

Number of NaSCN moles in 4 mL = 0.000008 moles

Number of NaSCN moles in 5 mL = 0.00001 moles

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