91Ó°ÊÓ

Calculate [HY^3-] in a solution prepared by mixing 10.00 mL of 0.010 0 M VOSO₄, 9.90 mL of 0.010 0 M EDTA, and 10.0 mL of buffer with a pH of 4.00

State the purpose of an auxiliary complexing agent and give an example of its use.

According to Appendix I, Cu²⁺ forms two complexes with acetate:

$\begin{array}{l}\mathbf{C}{\mathbf{u}}^{\mathbf{2}\mathbf{+}}\mathbf{+}\mathbf{C}{\mathbf{H}}_{\mathbf{3}}\mathbf{C}{\mathbf{O}}_{\mathbf{2}}^{\mathbf{−}}\mathbf{⇌}\mathbf{C}\mathbf{u}{\left(C{H}_{3}C{O}_2\right)}^{\mathbf{+}}\mathbf{\text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰}}{\mathbf{β}}_{\mathbf{1}}\left(=K_1\right)\\ \mathbf{C}{\mathbf{u}}^{\mathbf{2}\mathbf{+}}\mathbf{+}\mathbf{2}\mathbf{C}{\mathbf{H}}_{\mathbf{3}}\mathbf{C}{\mathbf{O}}_{\mathbf{2}}^{\mathbf{−}}\mathbf{⇌}\mathbf{C}\mathbf{u}{\left(C{H}_{3}C{O}_2\right)}_{\mathbf{2}}\mathbf{\text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰}}{\mathbf{β}}_{\mathbf{2}}\end{array}$

Calculate pCu²⁺ at each of the following points in the titration of 50.00 mL of 0.001 00 M Cu²⁺ with 0.00100 M EDTA at pH 11.00 in a solution with [NH₃] fixed at 1.00 M:

(a) 0 mL(b) 1.00 mL (c) 45.00 mL (d) 50.00 mL (e) 55.00 mL

Calculate pCu2+ at each of the following points in the titration of 50.00 mL of 0.001 00 M Cu2+ with 0.00100 M EDTA at pH 11.00 in a solution with [NH3] fixed at 1.00 M:

(a) 0 mL(b) 1.00 mL (c) 45.00 mL (d) 50.00 mL (e) 55.00 mL

Give three circumstances in which an EDTA back titration might be necessary

Describe what is done in a displacement titration and give an Example

Give an example of the use of a masking agent

What is meant by water hardness? Explain the difference between temporary and permanent hardness.

How many milliliters of 0.050 0 M EDTA are required to react with 50.0 mL of 0.010 0 M Ca²⁺? With 50.0 mL of 0.010 0 M Al³⁺?