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Chapter 12: Problem 34

Suggest three ways to increase the rate at which zinc dissolves in sulfuric acid.

Short Answer

Expert verified
Increase temperature, agitate the solution, and increase surface area of zinc.

Step by step solution

01

Increase Temperature

Raising the temperature of the solution increases the kinetic energy of the molecules involved. This leads to more frequent and energetic collisions between zinc and sulfuric acid molecules, thereby speeding up the dissolution process.
02

Agitate the Solution

Stirring or shaking the solution helps distribute the reactants more evenly and brings fresh portions of sulfuric acid into contact with the zinc, which can increase the rate of dissolution.
03

Increase Surface Area of Zinc

Breaking the zinc into smaller pieces or using zinc powder increases the surface area available for the reaction. A larger surface area allows more acid molecules to interact with the zinc simultaneously, resulting in a faster dissolution rate.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Chemical Reaction Rate
In chemical reactions, the reaction rate refers to how quickly the reactants are converted into products. This rate can be influenced by several factors. When zinc dissolves in sulfuric acid, the rate of this reaction determines how fast the zinc breaks down. To fully understand the factors that can change this rate, let's explore each one more deeply. By knowing how to control these factors, we can manipulate the speed of chemical reactions in our favor.
Temperature Effect
Temperature is a key player in the speed of chemical reactions. Heating up sulfuric acid increases the kinetic energy of its molecules. This extra energy makes the molecules move faster and collide more often.
These collisions must have enough energy to break bonds and form new ones, which is why hotter conditions usually speed up reactions.
  • More frequent collisions result in a higher reaction rate.
  • The collisions also become more energetic, further enhancing the rate.
So, increasing the temperature can be a very effective way to speed up the dissolution of zinc in sulfuric acid.
Agitation and Mixing
Mixing, shaking, or stirring a solution is another method to boost the rate of a chemical reaction. When you stir sulfuric acid, it helps to move unreacted portions of acid into contact with the zinc.
This consistent movement ensures that the reactants are well-distributed. Without agitation, the reactants might gather in one area, slowing down the reaction.
Agitation ensures even distribution and helps maintain a consistent reaction rate by:
  • Bringing fresh reactant molecules into contact with each other.
  • Preventing the build-up of product molecules from hindering the reaction.
Thus, stirring the solution can notably increase the dissolution rate of zinc.
Surface Area in Chemical Reactions
The surface area of the reactants plays a crucial role in the rate of chemical reactions. Zinc can be used as a solid block or in powdered form. Using smaller pieces or even zinc powder maximizes the surface area.
A larger surface area allows more sulfuric acid molecules to come into contact with zinc at the same time.
As a result, the reaction proceeds faster. This principle is especially important in industrial processes where efficiency is key.
  • Small pieces and powders provide more area for acid to interact with.
  • A larger surface area enables more frequent and simultaneous reactions.
Hence, increasing the surface area of zinc is a practical way to speed up its dissolution in sulfuric acid.

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