Question

question 7 (mandatory) (1 point)
what is the balanced chemical equation for the single displacement reaction of solid magnesium in an aqueous solution of hydrochloric acid?
o a) mg(s) + 2hcio3(aq) → mg(cio3)2(aq) + h2(g)
o b) mg(s) + 2hcio2(aq) → mg(cio3)2(aq) + h2(g)
o c) mg(s) + 2hci(aq) → mgcl2(aq) + h2(g)
o d) mg(s) + hci(aq) → mgcl(aq) + h(g)
o e) the reaction does not occur.

Explanation:

• In a single - displacement reaction, magnesium (\(Mg\)) reacts with hydrochloric acid (\(HCl\)). The general form of a single - displacement reaction is \(A + BC

ightarrow AC + B\). Here, \(Mg\) replaces \(H\) in \(HCl\).

• The formula for hydrochloric acid is \(HCl\), not \(HClO_3\) (which is chloric acid) or \(HClO_2\) (which is chlorous acid). So options a and b are incorrect as they have the wrong acid formula.
• For option d, the equation \(Mg_{(s)}+HCl_{(aq)}

ightarrow MgCl_{(aq)}+H_{(g)}\) is not balanced. The number of \(Cl\) and \(H\) atoms is not the same on both sides.

• Magnesium reacts with hydrochloric acid. The balanced chemical equation is \(Mg_{(s)}+2HCl_{(aq)}

ightarrow MgCl_2{(aq)}+H_2{(g)}\). Option c has the correct reactants (\(Mg\) and \(HCl\)) and is balanced (1 \(Mg\) atom, 2 \(H\) atoms, and 2 \(Cl\) atoms on both sides). Option e is incorrect because the reaction does occur.

Answer:

C. \(Mg_{(s)}+2HCl_{(aq)}
ightarrow MgCl_2{(aq)}+H_2{(g)}\)