CIA Demonstration: Self-Inflating Hydrogen Balloons (3.3.4) Flashcards
• The chemical reaction of magnesium and hydrochloric acid produces hydrogen gas, which can be collected in balloons.
• The chemical reaction of magnesium and hydrochloric acid produces hydrogen gas, which can be collected in balloons.
• The sizes of the four balloons reflect the stoichiometry of this reaction.
• The sizes of the four balloons reflect the stoichiometry of this reaction.
The chemical reaction of magnesium (Mg) and
hydrochloric acid (HCl) produces hydrogen gas (H2),
which can be collected in balloons.
Each flask contains one-tenth mole hydrochloric
acid. This amount of hydrochloric acid reacts with
one-twentieth mole magnesium metal to produce
one-twentieth mole hydrogen gas. If less
magnesium is present, less hydrogen gas will be
produced.
The sizes of the four balloons reflect the
stoichiometry of this reaction.
In the first two reactions, magnesium is the limiting
reagent. Less than one-twentieth mole hydrogen
gas is produced in each of these reactions. This is
reflected in the sizes of the attached balloons
relative to the third balloon.
The third reaction contains the exact stoichiometric
ratio of magnesium to hydrochloric acid. The
magnesium and the hydrochloric acid react
completely, producing one-twentieth mole hydrogen
gas.
In the fourth reaction, hydrochloric acid is the
limiting reagent. After all of the hydrochloric acid is
consumed, one-twentieth mole hydrogen gas is
produced, and one-twentieth mole magnesium
metal remains. Since the same amount of hydrogen
gas is produced in this reaction and in the third, the
balloons inflate to roughly the same size.
The chemical reaction of magnesium (Mg) and
hydrochloric acid (HCl) produces hydrogen gas (H2),
which can be collected in balloons.
Each flask contains one-tenth mole hydrochloric
acid. This amount of hydrochloric acid reacts with
one-twentieth mole magnesium metal to produce
one-twentieth mole hydrogen gas. If less
magnesium is present, less hydrogen gas will be
produced.
The sizes of the four balloons reflect the
stoichiometry of this reaction.
In the first two reactions, magnesium is the limiting
reagent. Less than one-twentieth mole hydrogen
gas is produced in each of these reactions. This is
reflected in the sizes of the attached balloons
relative to the third balloon.
The third reaction contains the exact stoichiometric
ratio of magnesium to hydrochloric acid. The
magnesium and the hydrochloric acid react
completely, producing one-twentieth mole hydrogen
gas.
In the fourth reaction, hydrochloric acid is the
limiting reagent. After all of the hydrochloric acid is
consumed, one-twentieth mole hydrogen gas is
produced, and one-twentieth mole magnesium
metal remains. Since the same amount of hydrogen
gas is produced in this reaction and in the third, the
balloons inflate to roughly the same size.
What is Molarity?
Molarity is a unit of concentration.
