1.How do we figure out the reaction order for a particular reactant? (a) We get

Question

1.How do we figure out the reaction order for a particular reactant?

(a) We get it from the stoichiometric coefficient.

(b) We get it from the ratio of concentrations and the ratio of time/reaction rate

2. If a reaction rate DOESN'T change when the concentration of A changes, that means the reaction is ZERO order in [A].

(a) True

(b)

3. According to the interactive pH titration, what is the initial pH when acetic acid is 0.1M?

4. At equivalence point, the moles of acid equals the moles of base added.

(a) True

(b) False

Explanation / Answer

1)

the reaction order cannot be detemined by the stoichiometry of the reactants

the answer is

b) we get it from the ratio of concentration and the ratio of time / reaction rate

2)

consider the rate law as

rate = k [A]^a

where a is the order

now for two different concentration

r2/r1 = ( [A]2 / [A]1)^a

given

reaction rate does not changes

So r2 = r1

so

1 = ( [A]2/ [A]1)^a

a = 0

so

True , the reaction is zero order in [A]

3)

we know that

acetic acid is a weak acid

so

it does not undergo 100% dissociation

So

upon dissociation of acetic acid

[H+] < 0.1

now

pH = -log [H+]

pH > -log 0.1

pH > 1

so

the initial pH of the 0.1 M acetic acid is C) 2.42

4)

a) True

at equivalence point , the moles of acid equals the moles of base added

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.