Solveeit Logo
Login

Question

Question: Write the ionic equation for the reaction between manganese dioxide and hydrochloric acid. A. \(Mn...

Write the ionic equation for the reaction between manganese dioxide and hydrochloric acid.
A. MnO2(s)+2Cl−(aq)→Mn2+(aq)+Cl2(g)+2H2O(l)Mn{O_2}(s) + 2C{l^ - }(aq) \to M{n^{2 + }}(aq) + C{l_2}(g) + 2{H_2}O(l)
B. MnO2(s)+4H+(aq)+2Cl−(aq)→Mn2+(aq)+Cl2(g)+2H2O(l)Mn{O_2}(s) + 4{H^ + }(aq) + 2C{l^ - }(aq) \to M{n^{2 + }}(aq) + C{l_2}(g) + 2{H_2}O(l)
C. MnO2(s)+3H+(aq)+2Cl−(aq)→Mn2+(aq)+Cl2(g)+2H2O(l)Mn{O_2}(s) + 3{H^ + }(aq) + 2C{l^ - }(aq) \to M{n^{2 + }}(aq) + C{l_2}(g) + 2{H_2}O(l)
D. MnO2(s)+4H+(aq)+2Cl−(aq)→Mn2+(aq)+Cl(g)+2H2O(l)Mn{O_2}(s) + 4{H^ + }(aq) + 2C{l^ - }(aq) \to M{n^{2 + }}(aq) + Cl(g) + 2{H_2}O(l)

Explanation

Solution

The ionic equation basically provides the information of the ions that exist in an aqueous medium. Moreover, the net ionic equation indicates the chemical species that undergo a chemical change. To solve this question, we need to know the charge on the respective ions and the species taking part in the reaction.

Complete step by step answer:
In the molecular equation, the compounds are expressed as molecules whereas in the ionic equation the electrolytes in aqueous solution are expressed as dissociated ions. Usually, this is a salt that is dissolved in water where the ionic species are followed by (aq) in the equation to indicate that they are in aqueous solution.
Now, the ions in the aqueous solution are stabilized by ion-dipole interactions with water molecules. Moreover, the ionic equation may be written for any electrolyte that dissociates and reacts in a polar solvent. In a balanced ionic equation, the number and types of atoms are the same on both sides of the reaction arrow. The net charge is the same on both sides of the equation.
Now, the ionic equation for the reaction between manganese dioxide and hydrochloric acid is as shown:
MnO2(s)+4H+(aq)+2Cl−(aq)→Mn2+(aq)+Cl2(g)+2H2O(l)Mn{O_2}(s) + 4{H^ + }(aq) + 2C{l^ - }(aq) \to M{n^{2 + }}(aq) + C{l_2}(g) + 2{H_2}O(l)

Hence, option B is correct.

Note: Don’t get confused with the complete ionic equation and net ionic equation. The complete ionic equation indicates all of the dissociated ions in a chemical reaction whereas the net ionic equation cancels out the ions that appear on both sides of the reaction arrow because they essentially don’t participate in the reaction of interest. The ions that further cancel out are called spectator ions.