Open Question
Complete and balance each gas-evolution equation. b. HCl(aq) + KHCO3(aq) → c. HC2H3O2(aq) + NaHSO3(aq) → d. (NH4)2SO4(aq) + Ca(OH)2(aq) →
6. Chemical Quantities & Aqueous Reactions
Gas Evolution Equations
Multiple Choice
When Mg(s) is added to HCl(aq), which gas is produced?
A
Oxygen (O_2)
B
Hydrogen (H_2)
C
Nitrogen (N_2)
D
Carbon dioxide (CO_2)
Verified step by step guidance1
Identify the reactants: solid magnesium (Mg) and aqueous hydrochloric acid (HCl).
Recall that magnesium is a metal that reacts with acids to produce a salt and a gas.
Write the general reaction of a metal with an acid: \(\text{Metal} + \text{Acid} \rightarrow \text{Salt} + \text{Hydrogen gas}\).
Apply this to magnesium and hydrochloric acid: \(\mathrm{Mg(s)} + 2\mathrm{HCl(aq)} \rightarrow \mathrm{MgCl_2(aq)} + \mathrm{H_2(g)}\).
From the balanced equation, observe that the gas produced is hydrogen gas, \(\mathrm{H_2}\).
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