In order for the reaction 2Al(s) + 6HCl(aq)→2AlCl3(aq) + 3H2(g) to occur, which of the following must be true?
A. Al must be above Cl on the activity series.
B. Al must be above H on the activity series.
C. Heat must be supplied for the reaction.
D. AlCl3 must be a precipitate.
B?
yes
/both. Taught for 50 years. Now retired.
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In order for the reaction 2Al+6HCl→2AlCl3+3H22Al+6HCl→2AlCl3+3H2 to occur, which of the following must be true?
Al must be above Cl on the activity series.
Al must be above H on the activity series.
Heat must be supplied for the reaction.
A precipitate must be formed.
To determine the correct answer choice, we need to consider the requirements for the reaction to occur.
In this reaction, aluminum (Al) reacts with hydrochloric acid (HCl) to produce aluminum chloride (AlCl3) and hydrogen gas (H2).
Option A suggests that Al must be above Cl on the activity series for the reaction to occur. The activity series is a list of metals in order of their reactivity, with the most reactive metals at the top. However, the activity series is not relevant to this reaction.
Option B states that Al must be above H on the activity series. This is the correct answer. The activity series is relevant here because Al is a more reactive metal than hydrogen (H). According to the activity series, more reactive metals can displace less reactive metals from compounds. Since Al is more reactive than H, it can displace H from HCl, resulting in the formation of AlCl3 and H2.
Option C suggests that heat must be supplied for the reaction to occur. While heat can increase the rate at which a reaction occurs, it is not a requirement for this particular reaction. Therefore, option C is incorrect.
Option D suggests that AlCl3 must be a precipitate. A precipitate is a solid that forms when two solutions are mixed together. In this reaction, AlCl3 is not a precipitate because it forms in an aqueous solution, meaning it remains dissolved in water. As a result, option D is incorrect.
In conclusion, the correct answer is Option B. Al must be above H on the activity series for the reaction to occur.