Hydracids

   
 
What are they?  |  How are they named? If we know the formula  | If we know the name  |  Examples  |  Exercises
   

What are they?

They are compounds formed by hydrogen and a nonmetal, a chalcogen (group 16) or halogen (group 17), in which the hydrogen has an oxidation number +1.

In these compounds hydrogen is written to the left of the nonmetal.

How are they named?

The name is formed by two words. First word "hydrogen". Second word is the root of the nonmetal with a suffix "-ide".

    Hydrogen NONMETAL-ide

These compounds are called hydracids because dissolve in water are acid dissolutions. It uses the subscript (aq) to indicate an aqueous solution.

In aqueous solution the name is formed by two words. First word a prefix "hydro-" connected to the root of the element with a suffix "-ic". Second word is the word "acid".

    Hydro-NONMETAL-ic acid

 

If we know the formula

    In the formula: Nonmetal is named with the suffix "-ide"

    In the formula: In aqueous solution the name is hydro-NONMETAL-ic acid

 

If we know the name

    In the name: The number of hydrogen matches up with the oxidation number of nonmetal.

    In the name: The number of hydrogen matches up with the oxidation number of nonmetal.

 

Examples

    In this group we include the HCN.

 

Systematic name

 

Aqueous solution name

HF  Hydrogen fluoride HF(aq)  Hydrofluoric acid
HCl  Hydrogen chloride HCl(aq)  Hydrochloric acid
H2S  Hydrogen sulfide H2S(aq)  Hydrosulfuric acid
H2Te  Hydrogen telluride H2Te(aq)  Hydrotelluric acid
HCN  Hydrogen cyanide HCN(aq)  Hydrocyanic acid

 

Exercises

In Formulae you have an exercise to write the names of these substances and to check your results. You also have the answer to the exercise.

In Names you have an exercise to write the formulae for these substances and to check your results. You have to introduce the formulae without subscripts, for example for water = H2O. You also have the answer to the exercise.

Formulae 1 Names 1 Formulae 2 Names 2

 


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