Asked by: Yanqing Trabazos
asked in category: General Last Updated: 29th May, 2020

What are Group I cations?

Group 1 cations includes those cations who selectively precipitates as chlorides by addition of diluted hydrochloric acid. These cations are respectevely: Ag+,Pb2+,Hg22+ .

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Furthermore, what are the Group 5 cations?

Group 5 cations are magnesium (II) Mg2+, potassium (I) K+ and sodium (I) Na+. These cations do not react with hydrochloric acid HCl, hydrogen sulphide H2S, ammonium sulphide and ammonium carbonate (NH4)2CO3.

Furthermore, what are the Group 3 cations? Group 3 cations is also called the hydroxides group, because it is made up of cations which precipitate as hydroxides in ammonia alkaline solution. More specifically they precipitate around pH 9, the pH made with ammonia and ammonium chloride (NH3 / NH4Cl), a very common buffer solution.

Consequently, why are Group V cations referred to as the soluble group?

The salts of the cations of group V, with few exceptions, are quite soluble, this accounts for the fact that there is no common precipitating reagent for the group. - This group is called "Soluble Group" because its cations remain soluble throughout the whole scheme of separation.

What are the Group 4 cations?

Group IV cations are calcium (II) Ca2+, strontium (II) Sr2+ and barium (II) Ba2+. Its group reagent is 1M solution of ammonium carbonate (NH4)2CO3 in neutral or alkaline medium. The medium needs to be neutral or alkaline because it is readily decomposed even by weak acids like acetic acid.

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