What is the group reagent of Group IIIA?

The group reagent of 3rd group is ammonium sulphide solution or hydrogen sulphide gas in the presence of ammonia and ammonium chloride.

What is the group reagent for Group III cation analysis?

The group reagent of 3 rd group is ammonium sulphide solution or hydrogen sulphide gas in the presence of ammonia and ammonium chloride .

What reagents are used to test for cations?

Dilute aqueous sodium hydroxide, NaOH(aq) and dilute aqueous ammonia solution, NH3 (aq) are used for the test for cations of inorganic salts in solution.

Why do we use sodium hydroxide to test for cations?

Since the compound forms an insoluble precipitate with hydroxide, it eliminates the alkali metals, calcium, strontium, and barium. Since the cation is not amphoteric, it also eliminates aluminum, chromium, lead, zinc, and tin.

What are the Group 3 cations?

Group III (Al3+, Cr3+, Fe3+, Zn2+, Ni2+, Co2+, Mn2+) cations produce slightly soluble sulfides (Ksp values more than 10-20) so they can be precipitated by relatively high amounts of sulfide ion; this can be achieved by adding a basic solution of H2S.

What are group reagents?

Hint: The Group reagent is a cocktail of reagents that serves as a prima facie indication of a particular cation, characterized by the formation of a precipitate during a positive test/result and no precipitation in the event of a negative test.

How can we test for cations?

Precipitation tests Identifying cations using sodium hydroxide solution. Add approximately 5 cm 3 of the solution to be tested to a test-tube. Add sodium hydroxide solution slowly drop wise.

Is NaOH a cation or anion?

…the compound NaOH is called sodium hydroxide, because it contains the Na+ (sodium) cation and the OH− (hydroxide) anion. As in binary ionic compounds, when a metal that can form multiple cations is present, a Roman numeral is required to specify the charge on the cation.

Is sodium hydroxide a cation?

Assorted References. …the compound NaOH is called sodium hydroxide, because it contains the Na+ (sodium) cation and the OH− (hydroxide) anion. As in binary ionic compounds, when a metal that can form multiple cations is present, a Roman numeral is required to specify the charge on the cation.

Can NaOH be used instead of nh3?

All Answers (4) NaOH is a far stronger base than ammonia, so you will need to adjust the concentration. NaOH by the way is soluble in methanol to about 6M, and there are no great dangers in preparing the solution, except that it gets hot as you dissolve the solid NaOH.

What are the three group 3 cations under the aluminum group?

Cations are typically divided into Groups, where each group shares a common reagent that can be used for selective precipitation. In today’s lab you will analyze solutions of the Group III cations, which include Cr3+, Al3+, Fe3+, and Ni2+.

What is the group reagent for Group 3 redicals?

group 3 redicals include aluminium, ferrous and ferric ions. The group reagent is : Ammonium Chloride in presence of excess Ammonium Hydroxide should be added to aqueous solution of salt. But if Ferrous ion is present (light green salt) then conc. nitric acid dhould also be added to convert ferrous ions into ferric ions.

What is the group reagent of ammonium chloride?

The group reagent is : Ammonium Chloride in presence of excess Ammonium Hydroxide should be added to aqueous solution of salt. But if Ferrous ion is present(light green salt) then conc.

What is the group reagent of 3rd Group in a filtrate?

Answer Wiki. The group reagent of 3rd group is ammonium sulphide solution or hydrogen sulphide gas in the presence of ammonia and ammonium chloride. When we add group reagent to the filtrate we will get precipitate of 3rd gr cations.

What is the counterion of sodium chloride?

Sodium chloride is an inorganic chloride salt having sodium (1+) as the counterion. It has a role as an emetic and a flame retardant. It is an inorganic chloride and an inorganic sodium salt.