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Question 4.2: Writing Net Ionic Equations Write a net ionic equation for e...

Writing Net Ionic Equations

Write a net ionic equation for each of the following molecular equations.

a. 2HClO_4(aq)  +  Ca(OH)_2(aq)  →  Ca(ClO_4)_2(aq)  +  2H_2O(l )

Perchloric acid, HClO_4, is a strong electrolyte, forming H^+ and ClO_4^- ions in solution. Ca(ClO_4)_2 is a soluble ionic compound.

b. HC_2H_3O_2(aq)  +  NaOH(aq)  →  NaC_2H_3O_2(aq)  +  H_2O(l )

Acetic acid, HC_2H_3O_2, is a molecular substance and a weak electrolyte.


You will need to convert the molecular equation to the complete ionic equation, then cancel spectator ions to obtain the net ionic equation. For each ionic compound in the reaction, use the solubility rules to determine if the compound will be soluble (in the solution as ions) or insoluble (present as an undissolved solid). For the complete ionic equation, represent all of the strong electrolytes by their separate ions in solution, adding (aq) after the formula of each. Retain the formulas of the other compounds. An ionic compound should have (aq) after its formula if it is soluble or (s) if it is insoluble.

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