Dmg Reaction With Nickel Ion

Reaction favors the formation of the nickel(II) ion, causing the dissolution of Ni(DMG)2 back into the mother liquor. Adding tartarate or citrate ions before the precipitation of the red nickel complex prevents interference from Cr, Fe and other metals. These anions selectively form tightly bound soluble. GRAVIMETRIC DETERMINATION OF NICKEL IN AN UNKNOWN SOLUTION AIM The main objective of this experiment is to determine the concentration of nickel (II) ion in a nickel solution with an unknown concentration by gravimetry. Write the chelation reaction between nickel and and DMG and how does the chelation reaction occur? It may be used in the preparation of nickel dimethylglyoxime, a dye complex used for the fabrication of dye-sensitized solar cells. Dimethylglyoxime may be used as a chelating agent for determining nickel ion in complexes by gravimetric, titrimetric or colorimetric analysis. Packaging 100, 500 g in poly bottle.

Balanced equation:
Ni(NO₃)₂ + 2 DMG = Ni(DMG)₂ + 2 NO₃
Reaction type: double replacement
Please tell about this free chemistry software to your friends!
Direct link to this balanced equation:

Instructions on balancing chemical equations:

Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below
Always use the upper case for the first character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide
To enter an electron into a chemical equation use {-} or e
To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.
Example: Fe{3+} + I{-} = Fe{2+} + I2
Substitute immutable groups in chemical compounds to avoid ambiguity.
For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced,
but PhC2H5 + O2 = PhOH + CO2 + H2O will
Compound states [like (s) (aq) or (g)] are not required.
If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.
Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.
Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reagents.

Examples of complete chemical equations to balance:Examples of the chemical equations reagents (a complete equation will be suggested):Give us feedback about your experience with chemical equation balancer.

chemical equations balanced today

Back to Online Chemical Tools Menu

By using this website, you signify your acceptance of Terms and Conditions and Privacy Policy.
© 2020 webqc.org All rights reserved

Periodic table

Unit converters

Chemistry tools

Chemical Forum

Chemistry FAQ

Constants

Symmetry

Chemistry links

Link to us

How to cite?

WebQC.Org
online education
free homework help
chemistry problems
questions and answers

Nickel ion testing is done by identifying colours nickel metal compounds or forming precipitates or solutions with other reagents. Nickel metal is placed in 3d block and it's atomic number is 28.

In this tutorial, we study about followings.

Some reactions and characteristics of nickel metal - we study these things before discussing qualitative analysis of testing Ni²⁺ ion because they are important in understanding Ni²⁺ testing experiments.
Qualitative analysis tests for nickel ion

Nickel metal properies and reactions

Nickel is the 22nd most abundant element in the earth's crust and occurs in a variety of sulfide ores. General configuration of nickel is 4s² 3d⁸. Major oxidation state (oxidation number) of nickel is +2. Nickel is a silvery metal that has a beautiful high polish.

Properties of nickel metal

Nickel react with dilute acids to form hydrogen gas and Ni²⁺ ion.
Nickel is a silvery white metal
No reaction between nickel and moisture in air
Powdered nickel readily reacts with carbon monoxide (CO) at normal conditions to form tetracarbonylnickel(0) ( [Ni(CO)₄] ) complex. In this complex, oxidation number of Ni is zero.
Ni_(s) + 4CO_(g) → [Ni(CO)₄]_(g)

Reactions of nickel metal

Nickel and acids reaction

Nickel is soluble in dilute acids such as HCl or dilute H₂SO₄ to form green solution hexaaquanickel(II) ion / [Ni(H₂O)₆]²⁺ and hydrogen gas (H₂).
Ni_(s) + 6H₂O_(l) + 2H⁺_(aq) → [Ni(H₂O)₆]²⁺_(aq) + H_2(g)
If an alkali, NaOH is added to this green solution, a green precipitate, [Ni(OH)₂(H₂O)₄] is formed.

Qualitative Analysis Tests of nickel ion and compounds

When we testing nickel ion and it's compounds we should have a knowledge of whether those compounds are precipitates or solutions and colours of them. Which are important to identify nickel ion from other metal ions. We discuss few examples of identifying nickel ion from other cations.

Nickel ion and aqueous ammonia solution | Ni²⁺ + NH₃

Add aqueous ammonia solution to aqueous nickel ion solution. Nickel hydroxide, ( Ni(OH)₂ ), a light green precipitate forms. When add excess ammonia, Nickel hydroxide precipitate dissolve and give blue colour solution due to formation of hexaamminenickel(II) ion ( [Ni(NH₃)₆]²⁺ ) coordination complex. If you add concentrated ammonia solution, intensity of blue colour increases.

Hydrogen sulfide and nickel(ii) ion | H₂S + Ni²⁺

Send hydrogen sulfide (H₂S) under acidic state to nickel(ii) ion solution. But a precipitate doesn't form.

Send H₂S when NH_3(aq)/NH₄Cl are exist in nickel(ii) ion solution. Then you can see a Nickel sulfide (NiS) ,a black precipitate is formed. Also add (NH₄)₂S to nickel(ii) ion solution. It also gives NiS ,the black precipitate.

Nickel ion and chloride ion reaction

Ni²⁺_(aq) ions reacts with concentrated Cl^- ions in the presence of ethanol medium to give tetrachloronickel(II) ion / [NiCl₄]^2-, a blue colour solution.

Ni²⁺_(aq) ions reacts with concentrated Cl^- ions in the presence of acids to give tetrachloronickel(II) ion / [NiCl₄]^2-, a yellow brown solution.
[NiCl₄]^2- is a tetrahedral coordination complex.

Nickel ion and nitrile ions

Ni²⁺_(aq) ions reacts slowly with nitrile ions (CN^-) to give nickel cyanide / [Ni(CN)₂], which is a light green precipitate.
This precipitate will dissolve in excess CN^- to form tetracynonickel(II) ion / [Ni(CN)₄]^2-, yellow colour solution.

Nickel dimethylglyoxime complex test

Add dimethylglyoxime(DMG) to nickel ion solution. Next add little bit of ammonia to make solution basic. It will give a red precipitate.

This is a very specific testing reaction of nickel ion.

Questions of nickel ion tests under qualitative analysis of inorganic chemistry

What tests can be done to identify solid nickel hydroxide and chromium hydroxide?

Chromium hydroxide and nickel hydroxide are green precipitates. So we cannot identify them from looking their colours and dissolving in water.

But we have learnt about amphoteric compounds and elements. In that lesson, you may have learnt that, chromium hydroxide is an amphoteric hydroxide. But nickel hydroxide is not an amphoteric hydroxide. But both of these hydroxides have basic characteristics.

We are going to check amphoteric characteristics of these two hydroxides by adding aqueous NaOH. Chromium hydroxide should dissolve when add NaOH more and more. From that, we can identify nickel hydroxide and chromium hydroxide.

Determination of nickel +2 ion?

Aqueous Ni²⁺ solution is green colour. When adding aqueous NaOH, a green precipitate is given and with addition of excess aqueous NaOH, precipitate does not dissolve. But addition of aqueous NH₃, blue colour solution [ Ni(NH₃)₆]²⁺ is given.

What are the precipitates of nickel ion and give their colours?

Nickel hydroxide - Ni(OH)₂ - green
Nickel carbonate - NiCO₃ - Green
Nickel cyanide - Ni(CN)₂ - Yellow brown
Nickel sulfide - NiS - black

Metal precipitates and colours

What is the colour of nickel ion in aqueous state?

Nickel (+II) ion gives a green colour solution in aqueous state.

3d metal ions compounds colours

What ions nickel metal form?

Major oxidation state of nickel metal is +2.