Question

Write the balanced chemical equation for the reaction of the weak acid hcn with water. include the phase of each species.

Answer 1

Hydrogen Cyanide is considered as a weak acid. The pKa value of HCN is 9.21. When HCN is dissolved in water it slightly ionizes to produce H⁺ in the form of H₃O⁺ as water acts as a base and CN⁻ (Cyanide Ion).

The balanced chemical equation along with phases of species is as follow,

                     HCN ₍aq₎  +  H₂O ₍l₎    ⇄    H₃O⁺ ₍aq₎  +  CN⁻ ₍aq₎ 

In above equation the sign "⇄" indicates that HCN is not ionizing completely and the reaction is reversible in nature.

Answer 2

The balanced chemical equation for the reaction of weak acid  and water is Hydrogen Cyanide + water   ⇄  hydrogen ion   +  Cyanide ion

The given parameter;

• Weak acid = Hydrogen Cyanide
• Water

When Hydrogen Cyanide  is dissolved in water it slightly ionizes to produce  hydrogen ion in the form of $H_3O^+$ while the water acts as a base producing Cyanide ion  as basic ion.

The reaction of the weak acid with water including the phase of each species is written below;

Hydrogen Cyanide + water   ⇄  hydrogen ion   +  Cyanide ion

Thus, the balanced chemical equation for the reaction of weak acid  and water is Hydrogen Cyanide + water   ⇄  hydrogen ion   +  Cyanide ion

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