Estimation Of Nickel Ii Using Dimethylglyoxime Dmg File
Nickel Dmg
Estimation Of Nickel Ii Using Dimethylglyoxime Dmg 2
Estimation Of Nickel(ii Using Dimethylglyoxime Dmg)

An Alternative Method for the Preparation of Bis(Dimethylglyoximato)Nickel(II) Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry: Vol.

Table of Content

Page
1.	Title of experiment
2.	Table of contents
3	Abstract	2
4.	Introduction	3
5.	Materials and methods	4
6	Results	6
7	Discussion	8
8.	Conclusion	10
9.	Reference	11

Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II) ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C.
Mean% Ni in original sample = (0.64% + 0.73% + 0.61%) / 3 = 0.66% Discussion By performing this experiment we be able to determine the concentration of nickel (II) ion gravimetrically by precipitation with organic reagent dimethylglyoxime (DMG). DMG will precipitate the analyte which later separated from the solution and dried.

Abstract

The main objective of this experiment is to determine the concentration of nickel (II) ion in a nickel sample solution of unknown concentration. Gravimetric method is used whereby dimethylglyoxime (1% in alcohol) is added to precipitate the analyte which is later separated from the solution and dried. The concentration of the sample solution has been calculated as 0.109 mg/mL.

Estimation Of Nickel Ii Using Dimethylglyoxime Dmg File

Introduction

In this lab, you will be precipitating nickel (Ni2+) from an unknown Nickel ore. You will need to determine the % of nickel in the unknown which you will report on your unknown card and your lab report. Accuracy will play a large part of your grade so do every step CAREFULLY!

Nickel is precipitated with an organic precipitating agent termed dimethylglyoxime (DMG) as shown below. Organic reagents often react with more than one metal ion, therefore, adequate specification can be achieved with concentration and pH. DMG forms a chelating complex with the metal ion and forms a bright red precipitate Ni(C4H7N2O2)2 in a slightly basic solution of 1:1 aqueous ammonia. The precipitate is washed with a 30% ethanol solution and weighed (constant weight) after drying the frits in the oven at 110EC for 2 hours.

Background Information of Method

The gravimetric method used in this experiment is among the most accurate methods but time-consuming. Overall, this method includes precipitation of the analyte in aqueous solution which is then separated from the mother liquor, washed, heated to constant weight and weighed as compound of definite composition.

Technique used

Gravimetric analysis is one of the most accurate analytical methods available. It is concerned with the determination of a substance by the process of weighing. The element or radical to be determined is converted into a stable compound of definite composition and the mass of the compound is determined accurately. From this, the mass of element or radical is calculated.

The gravimetric analysis involves

a) precipitation

b) filtration

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c) washing of the precipitate and

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d) drying, ignition and weighing of the precipitate.

Rationale / Purpose of Experiment

This experiment aims to determine the concentration of the nickel (II) ion (Ni²⁺) in a sample solution that contains it.

Background Information of Analyte

The analyte in this experiment is Ni²⁺. As an element, it is one of the transition metals alongside copper, zinc, iron, manganese, etc. In ionic form, it usually possesses a charge of +2 and gives the solution containing it a green colour. When in contact with basic chemicals, such as aqueous sodium hydroxide (NaOH) and ammonia, it precipitates into a green nickel salt compound; this means nickel (II) solution is acidic. In this experiment, it comes in contact with dimethylglyoxime (DMG, C₄H₆(NOH)₂) and precipitated as nickel dimethylglyoximate (Ni(DMG)₂) in red.

Materials and Methods
- Apparatus

Volumetric flask (100 mL), beaker (400 mL), labelling tape, pipette (20 mL), measuring cylinder, microwave oven, thermometer, dropper, electronic weigh, glass rod, basin, sintered glass crucibles, desiccator, tongs, blue litmus paper, aspirator, side-arm filtering flask, retort stand, retort clamps.

Nickel Dmg

Chemicals and Reagents

Nickel (Ni²⁺) sample solution, distilled water, dimethylglyoxime (DMG, 1% in alcohol), nitric acid (HNO₃, 6 M), urea, oxalic acid, dilute ammonium hydroxide (NH₄OH).

Experimental Procedures

A sample of nickel solution in a 100 mL volumetric flask is obtained and diluted to the mark with distilled water. The flask is shaken to mix the solution thoroughly and three aliquot samples (20 mL) are transferred into separate 400 mL beakers using a pipette. Each replicate is labelled as 1, 2 and 3 respectively and added distilled water (approximately 150 mL) before being heated to around 80°C in a microwave oven. DMG (10 mL) is added slowly to each replicate which their acidity are later checked with blue litmus paper. HNO₃ (6 M) is added dropwise if any of the replicates is not acidic. Urea (3 g) is weighed and add