The first order reaction of methyl isonitrile to form acetonitrile has a rate constant of k = 1.7 × 10−15 at 298 K. What will ha
ppen to the rate constant if the temperature is decreased to 100 K?
2 answers:
Answer : If the temperature is decreased to 100 K then the rate constant will be, decrease.
Explanation :
According to the Arrhenius equation, the rate constant of the reaction is directly proportional to the temperature.
Taking ln on both the sides, we get
where,
K = rate constant
Ea = activation energy
T = temperature
R = gas constant
a = Arrhenius constant
As we know that the increase in the rate of reaction with increase in the temperature is mainly due to increase in the number of effective collision. That means as the temperature increases, the number of effective collision increases and the value of rate constant also increases or vice-versa.
As per question, the temperature of the reaction decreases that means the number of effective collision decreases and the value of rate constant also decreases.
Hence, if the temperature is decreases from 298 K to 100 K then the rate constant will be, decrease.
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Explanation:
Relation between pH and concentration of hydrogen ions is as follows.
pH =
So, it means that an increase in the value of pH will show that there occurs a decrease in concentration of hydrogen ions.
Therefore, the solution becomes basic in nature.
On the other hand, a decrease in the value of pH will show that there occurs an increase in the concentration of hydrogen ions.
Therefore, the solution becomes more acidic in nature.
Hence, if the pH of a solution is decreased from pH 8 to pH 6 it means that the concentration of hydrogen ions has increased in the solution.