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Chapter 12: Q14P (page 283)

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

Short Answer

Expert verified

The bond between metal cation and the auxiliary complexing agent must be strong enough so that precipitation of hydroxide can be prevented as well as without interference with EDTA titration.

NH3 retains Zn2+ in solution at high pH , but easily displaced by EDTA

Step by step solution

01

Introduction

If an auxiliary complexing agent is induced while EDTA titration, formation of hydroxide became restricted. This agent is added if any of the titration solution is a metal cation.

02

Purpose

The bond between metal cation and the auxiliary complexing agent must be strong enough so that precipitation of hydroxide can be prevented as well as without interference with EDTA titration.

03

Example

NH3 retains Zn2+ in solution at high pH , but easily displaced by EDTA

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Most popular questions from this chapter

Calculate pCu2+ (to the 0.01 decimal place) at each of the following points in the titration of 50.0 mL of 0.040 0 M EDTA with 0.080 0 M Cu (NO3)2 at pH 5.00: 0.1, 5.0, 10.0, 15.0, 20.0, 24.0, 25.0, 26.0, and 30.0 mL. Make a graph of pCu2+ versus volume of titrant.

List four methods for detecting the end point of an EDTA Titration

Consider the titration of 25.0 mL of 0.020 0 M MnSO4 with 0.010 0 M EDTA in a solution buffered to pH 8.00. Calculate pMn2+ at the following volumes of added EDTA and sketch the titration curve:

(a) 0 mL (b) 20.0 mL (c) 40.0 mL (d) 49.0 mL (e) 49.9 mL (f) 50.0 mL (g) 50.1 mL

(h) 55.0 mL (i) 60.0 mL

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

Find αZn2+if free, unprotonated [NH3] = 0.02 M.
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