Question

Write the overall molecular equation, the total ionic equation, and the net ionic equation for the reaction of magnesium with hydrochloric acid. molecular equation: total ionic equation: net ionic equation: How many milliliters of hydrogen would be collected at a pressure of 755 torr and 23 degree C in a reaction between 0.540 grams of aluminum and an excess of hydrochloric acid? In this experiment, you were limited to two significant figures in your determination of the molar mass. Suggest what you could do to increase the precision of the experiment to three significant figures. Be sure to think through the consequences of your suggestion.

Answer 1

1. Molecular equation : Mg + 2 HCl $\rightarrow$ MgCl₂ + H₂(g)

2. Total Ionic Equation :Add we must account water molecules in the hydronium too.

Mg + 2 H₃O + 2 Cl^-   $\rightarrow$   MgCl₂ + H₂(g) + 2H₂O

Mg + 2 H₃O + 2 Cl^-    $\rightarrow$ Mg⁺² + 2 Cl^- + H₂ + 2H₂O

Cl^- does not change.

Mg + 2 H₃O $\rightarrow$ Mg⁺²  + H₂ +  2H₂O      

We do not use Hydronium ions.

  Mg + 2 H⁺ + 2 Cl^-   $\rightarrow$ Mg⁺²  + 2 Cl^- + H₂ : Ionic equation

Mg + 2 H⁺    $\rightarrow$ Mg⁺²  + H₂ : Net Ionic equation