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Sodium Sulfide Reaction With Water
The reaction of sodium sulfide with water is an important phenomenon in chemistry. Sodium sulfide ($Na_2S $) reacts in contact with water.
The principle of the reaction is that sodium sulfide is a strong base and weak acid salt. Sulfur ions ($S ^ {2 -} $) will hydrolyze in water. The first step hydrolysis generates thiohydrogen ions ($HS ^ - $) and hydroxide ions ($OH ^ - $）， the ion equation is: $S ^ {2 - } + H_2O\ rightleftharpoons HS ^ - + OH ^ - $ 。 If the reaction continues, the hydrogen sulfide ion ($HS ^ - $) will be further hydrolyzed to form hydrogen sulfide ($H_2S $) and hydroxide ion ($OH ^ - $）， The ion equation is: $HS ^ - + H_2O\ rightleftharpoons H_2S + OH ^ - $ 。
This reaction causes the solution to be alkaline, due to the hydrolysis of hydroxide ions. Looking at the reaction phenomenon, it can be seen that there is a weak smell of hydrogen sulfide escaping from the solution, which is due to the hydrolysis of hydrogen sulfide gas.
In many chemical fields, the characteristics of this reaction are often used. For example, in some wastewater treatment processes, sodium sulfide can be used to react with metal ions in water to form insoluble sulfide precipitation, and the alkaline environment created by the reaction of sodium sulfide with water helps to promote the formation of metal sulfide precipitation, and then achieve the purpose of removing heavy metal ions in water. In some chemical synthesis reactions, the alkaline conditions produced by the reaction of sodium sulfide with water can be used as one of the reaction conditions to assist in the synthesis of specific compounds.
The principle of the reaction is that sodium sulfide is a strong base and weak acid salt. Sulfur ions ($S ^ {2 -} $) will hydrolyze in water. The first step hydrolysis generates thiohydrogen ions ($HS ^ - $) and hydroxide ions ($OH ^ - $）， the ion equation is: $S ^ {2 - } + H_2O\ rightleftharpoons HS ^ - + OH ^ - $ 。 If the reaction continues, the hydrogen sulfide ion ($HS ^ - $) will be further hydrolyzed to form hydrogen sulfide ($H_2S $) and hydroxide ion ($OH ^ - $）， The ion equation is: $HS ^ - + H_2O\ rightleftharpoons H_2S + OH ^ - $ 。
This reaction causes the solution to be alkaline, due to the hydrolysis of hydroxide ions. Looking at the reaction phenomenon, it can be seen that there is a weak smell of hydrogen sulfide escaping from the solution, which is due to the hydrolysis of hydrogen sulfide gas.
In many chemical fields, the characteristics of this reaction are often used. For example, in some wastewater treatment processes, sodium sulfide can be used to react with metal ions in water to form insoluble sulfide precipitation, and the alkaline environment created by the reaction of sodium sulfide with water helps to promote the formation of metal sulfide precipitation, and then achieve the purpose of removing heavy metal ions in water. In some chemical synthesis reactions, the alkaline conditions produced by the reaction of sodium sulfide with water can be used as one of the reaction conditions to assist in the synthesis of specific compounds.
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