Constants | Periodic Table PartA Some reactions are so rapid that they are said

Question

Constants | Periodic Table PartA Some reactions are so rapid that they are said to be diffusion-controlled; that is, the reactants react as quickly as they can collide. An example is the neutralization of HO by OH , which has a second-order rate constant of 1.3 x 1011 Ms1at 25 C. % lf equal volumes of 3.8 M HCI and 3.8 M Na the acid to be neutralized? are mixed instantaneously, how much time is required for 99 Express your answer using two significant figures. t- Submit Request Answer Part Under normal laboratory conditions, would you expect the rate of the acid-base neutralization to be limited by the rate of the reaction or by the speed of mixing? by the rate of the reaction by the speed of mixing

Explanation / Answer

Solution :-

Part A)

Initial molarity of acid [A]o= 3.8 M

Lets calculate the amount of acid reacted when it reaches to 99.999%

3.8M * 99.999 % /100 % = 3.79996 M

Final concentration of acid remained = 3.8 M – 3.79996 M = 3.8*10^-5 M

Second order rate constant K = 1.3*10^11 M-1.s-1

Time = ?

Second order integrated rate law is as follows

1/[A]t = Kt + (1/[A]o)

1/3.8*10^-5 = 1.3*10^11 M-1 s-1 * (t) + (1/3.8)

26316 = 1.3*10^11 M-1s-1 * t + 0.2632

26316-0.2632 / 1.3*10^11 M-1s-1 =t

2.0*10^-7 s = t

Therefore time needed for the reaction is 2.0*10^-7 s

Part B)

Since the time required to complete the reaction is very less. Therefore by the speed of mixing the rate can be limited.

By the speed of mixing      

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---