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Double arrow means reversible reaction while single arrow represents complete reaction.For strong acid such as HCl,they undergo ionization to form H+ and Cl-.For weak acid such as H2CO3,it undergoes reversible reaction.

H2CO3->H+ + HCO3-

HCO3- <->H+ + CO3 2-

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Why do we use a double arrow in the dissociation equation for a weak acid?

The double arrow in a dissociation equation for a weak acid represents that the reaction can occur in both the forward and reverse directions. Weak acids only partially dissociate in water, so the equilibrium can shift in either direction depending on the conditions.


Why is only one arrow required for the dissociation of a strong acid?

Strong acids, such as HCl, dissociate almost completely in water to produce H+ ions and the corresponding anions. Since the dissociation is essentially complete, only one arrow is used to indicate the direction of the reaction towards product formation. This implies that the reaction is highly favored in the forward direction.


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The arrow that is used to indicate a reverse or backward reaction in a chemical equation is called a double-headed arrow.


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Related Questions

Why do we use a double arrow in the dissociation equation for a weak acid?

The double arrow in a dissociation equation for a weak acid represents that the reaction can occur in both the forward and reverse directions. Weak acids only partially dissociate in water, so the equilibrium can shift in either direction depending on the conditions.


Why is only one arrow required for the dissociation of a strong acid?

Strong acids, such as HCl, dissociate almost completely in water to produce H+ ions and the corresponding anions. Since the dissociation is essentially complete, only one arrow is used to indicate the direction of the reaction towards product formation. This implies that the reaction is highly favored in the forward direction.


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To find the graphical solution when adding vectors you can draw a?

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