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Chapter 12: Q28P (page 285)

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

Short Answer

Expert verified

When an analyte replaces a metal ion and results in formation of a complex. Then it is known as Displacement titration.

Displacement of Ni2+ from NiCN42-using the analyte Ag+. Then the displaced Ni2+is titrated by EDTA in order to determine the amount of Ag+present.

Step by step solution

01

EDTA

EDTA, also known as ethylenediaminetetraacetic acid forms strong complexes with metal ions and plays a major role in quantitative analysis. In industries it is used as a metal binding agent and used in production of detergents, cleaning agents, food additives etc. There are several types of EDTA titration techniques like direct titration, indirect titration, back titration, displacement titration, etc.

02

Displacement Titration

When an analyte replaces a metal ion from a complex and titrates with that displaced metal ion, then it is called displacement titration.

03

Example of Displacement Titration

Displacement of Ni2+ from NiCN42-using the analyte Ag+. Then the displaced Ni2+is titrated by EDTA in order to determine the amount of Ag+present

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Most popular questions from this chapter

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

Spreadsheet equation for auxiliary complexing agent. Consider the titration of metal M (initial concentration = CM, initial volume = VM) with EDTA (concentration = CEDTA, volume added = VEDTA) in the presence of an auxiliary complexing ligand (such as ammonia). Follow the derivation in Section 12-4 to show that the master equation for the titration is

ϕ=CETDAVETDACMVM=1+Kf"[M]free-[M]free+Kf"[M]freeCMKf"[M]free+[M]free+Kf"[M]free2CETDA

where role="math"> is the conditional formation constant in the presence of auxiliary complexing agent at the fixed pH of the titration (Equation 12-18) and [M]free is the total concentration of metal not bound to EDTA. [M]free is the same as [M] in Equation 12-15. The result is equivalent to Equation 12-11, with [M] replaced by [M]free and Kf replaced by Kf".

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

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
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