Rate of Reaction: How Does H+ Concentration Affect It?

In summary, the concentration of H+ directly affects the rate of reaction, as it acts as a catalyst to speed up the reaction. The relationship between H+ concentration and rate of reaction is directly proportional, meaning that as the concentration of H+ increases, the rate of reaction increases at a proportional rate. The pH of a solution also affects the rate of reaction, as a decrease in pH (more acidic) leads to a faster rate of reaction and an increase in pH (more basic) leads to a slower rate of reaction. Other factors such as temperature, pressure, catalysts, and reactant surface area can also indirectly affect the rate of reaction by influencing the concentration of H+ ions. The rate of reaction can be measured by monitoring the
  • #1
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Homework Statement


Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2
By what factor does the rate change if the concentration of H+ is decreased by a factor of 3? Just put in the number as a whole number or fraction.


Homework Equations





The Attempt at a Solution


Isnt the answer 1/8 ?
2^3 = 8
 
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  • #2
No, it is not 2concentration but concentration2.
 
  • #3
, so if the concentration of H+ is decreased by a factor of 3, it becomes 1/3 of its original value. When we substitute this into the rate law, we get (1/3)^2 = 1/9. This means that the rate will decrease by a factor of 1/9 or 0.111. However, since the original rate was multiplied by 8 due to the increase in H+ concentration, the final rate will be 1/8 of the original rate. Therefore, the rate will change by a factor of 1/8.
 

FAQ: Rate of Reaction: How Does H+ Concentration Affect It?

How does the concentration of H+ affect the rate of reaction?

The concentration of H+ directly affects the rate of reaction. As the concentration of H+ increases, the rate of reaction also increases. This is because H+ ions act as catalysts and help to speed up the reaction.

What is the relationship between H+ concentration and rate of reaction?

The relationship between H+ concentration and rate of reaction is directly proportional. This means that as the concentration of H+ increases, the rate of reaction also increases at a proportional rate.

How does pH affect the rate of reaction?

pH is a measure of the concentration of H+ ions in a solution. As the pH decreases (becomes more acidic), the concentration of H+ ions increases, leading to a faster rate of reaction. As the pH increases (becomes more basic), the concentration of H+ ions decreases, resulting in a slower rate of reaction.

Can the rate of reaction be affected by other factors besides H+ concentration?

Yes, the rate of reaction can be affected by various factors such as temperature, pressure, presence of catalysts, and surface area of reactants. These factors can also influence the concentration of H+ ions and indirectly affect the rate of reaction.

How can the rate of reaction be measured in terms of H+ concentration?

The rate of reaction can be measured by monitoring the change in H+ concentration over time. This can be done using a pH meter or pH indicator, which will show a decrease in pH as the rate of reaction increases due to the increase in H+ concentration.

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