Chemistry
Chemistry
4th Edition
ISBN: 9780078021527
Author: Julia Burdge
Publisher: McGraw-Hill Education
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Question
Chapter 22, Problem 43QP
Interpretation Introduction

Interpretation:

The formation constant for [Fe(H2O)5NCS]2+ for the given conditions is to be calculated.

Concept introduction:

The formation constant describes the formation of a complex ion that takes place from its central ion and attached ligands. Its symbol is Kf.

Expert Solution & Answer
Check Mark

Answer to Problem 43QP

Solution: 1.4×102 M1 

Explanation of Solution

Given information:

Volume of Fe(NO3)3 is 1.0 mL.

Concentration of Fe(NO3)3 is 0.20 M.

Volume of KSCN is 1.0 mL.

Concentration of KSCN is 1.0×103 M.

Volume of HNO3 is 8.0 mL.

Concentration of [Fe(H2O)5NCS]2+ is 7.3×105 M.

The given chemical equation is as:

[Fe(H2O)6]3++SCNH2O+[Fe(H2O)5NCS]2+

According to the above equation, the expression for theformation constant (Kf) is as:

Kf=[Fe(H2O)5NCS]2+[Fe(H2O)6]3+[SCN]

According to the given information, the original volumes of both Fe(III) and SCN were 1.0 mL and the final volume is 10.0 mL. This difference represents the ten-fold dilution. So, the concentrations of Fe(III) and SCN will become:

Fe(III)=0.20 M10=0.020 MSCN=1.0×103 M10=1.0×104 M

Now, make an ICE table as:

                          [Fe(H2O)6]3++SCNH2O+[Fe(H2O)5NCS]2+Initial(M)              0.020              1.0×104       0           0Change(M)      7.3×105    7.3×105      x         7.3×105 Equilibrium(M)   0.020              2.7×105        x         7.3×105

From the ICE table, the expression of Kf will be as:

Kf=7.3×105 M(0.020M)(2.7×105M)1.4×102 M1 

Conclusion

Hence, the formation constant of [Fe(H2O)5NCS]2+ is 1.4×102 M1 .

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Chapter 22 Solutions

Chemistry

Ch. 22.3 - Prob. 1PPACh. 22.3 - Prob. 1PPBCh. 22.3 - Prob. 1PPCCh. 22.3 - Prob. 1CPCh. 22.3 - Prob. 2CPCh. 22.4 - Prob. 1PPACh. 22.4 - Practice Problem BUILD Transition metal ions can...Ch. 22.4 - Prob. 1PPCCh. 22 - Prob. 1QPCh. 22 - Prob. 2QPCh. 22 - 22.3 Explain why atomic radii decrease very...Ch. 22 - Prob. 4QPCh. 22 - Write the electron configurations of the following...Ch. 22 - Prob. 6QPCh. 22 - Prob. 7QPCh. 22 - Prob. 8QPCh. 22 - Describe the interaction between a donor atom and...Ch. 22 - Prob. 10QPCh. 22 - Complete the following statements for the complex...Ch. 22 - Prob. 12QPCh. 22 - Prob. 13QPCh. 22 - Prob. 14QPCh. 22 - Prob. 15QPCh. 22 - Prob. 16QPCh. 22 - Prob. 17QPCh. 22 - Prob. 18QPCh. 22 - Prob. 19QPCh. 22 - Prob. 20QPCh. 22 - Prob. 21QPCh. 22 - The complex ion [Ni ( CN ) 2 Br 2 ] 2- has a...Ch. 22 - Prob. 23QPCh. 22 - Prob. 24QPCh. 22 - Prob. 25QPCh. 22 - Prob. 26QPCh. 22 - Prob. 27QPCh. 22 - Prob. 28QPCh. 22 - Prob. 29QPCh. 22 - Prob. 30QPCh. 22 - Prob. 31QPCh. 22 - Prob. 32QPCh. 22 - Prob. 33QPCh. 22 - Prob. 34QPCh. 22 - Prob. 35QPCh. 22 - Prob. 36QPCh. 22 - Prob. 37QPCh. 22 - Prob. 38QPCh. 22 - Prob. 39QPCh. 22 - Prob. 40QPCh. 22 - Prob. 41QPCh. 22 - A concentrated aqueous copper(II) chloride...Ch. 22 - Prob. 43QPCh. 22 - Prob. 44QPCh. 22 - Prob. 45APCh. 22 - Prob. 46APCh. 22 - Prob. 47APCh. 22 - Prob. 48APCh. 22 - Prob. 49APCh. 22 - Draw qualitative diagrams for the crystal held...Ch. 22 - Prob. 51APCh. 22 - Prob. 52APCh. 22 - Prob. 53APCh. 22 - Prob. 54APCh. 22 - Prob. 55APCh. 22 - Prob. 56APCh. 22 - Prob. 57APCh. 22 - Prob. 58APCh. 22 - 22.59 The -porphyrin complex is more stable than...Ch. 22 - Prob. 60APCh. 22 - Prob. 61APCh. 22 - Prob. 62APCh. 22 - Prob. 63APCh. 22 - Prob. 64APCh. 22 - Prob. 65APCh. 22 - Prob. 66APCh. 22 - Prob. 67APCh. 22 - Prob. 68APCh. 22 - Locate the transition metal atoms and ions in the...Ch. 22 - Prob. 70APCh. 22 - Prob. 71APCh. 22 - Copper is known to exist in the +3 oxidation...Ch. 22 - 22.73 Chemical analysis shows that hemoglobin...Ch. 22 - Prob. 74APCh. 22 - Prob. 75APCh. 22 - Prob. 76APCh. 22 - 22.77 Commercial silver-plating operations...Ch. 22 - Prob. 78APCh. 22 - 22.79 (a) The free Cu(I) ion is unstable in...Ch. 22 - Prob. 1SEPPCh. 22 - Prob. 2SEPPCh. 22 - Prob. 3SEPPCh. 22 - Prob. 4SEPP
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