1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
gogolik [260]
3 years ago
8

g On the basis of their respective pKa values, determine which is the stronger acid, acetic acid (pKa 5 4.7) or benzoic acid (ma

rgin; pKa 5 4.2). By what factor do their acidities differ?
Chemistry
1 answer:
ozzi3 years ago
5 0

Answer:

Benzoic acid is the stronger acid

Explanation:

Weak acids do not dissociate completely in the solution. They exists in equilibrium with their respective ions in the solution.

The extent of dissociation of the acid furnising hydrogen ions can be determined by using dissociation constant of acid (K_a).

Thus for a weak acid, HA

HA \rightleftharpoons A^- + H^+

The K_a is:

K_a= \frac{[A^-][H^+]}{[HA]}

The more the K_a, the more the acid dissociates, the more the stronger is the acid.

Also,

pK_a is defined as the negative logarithm of K_a.

So, more the pK_a, less is the K_a and vice versa

All can be summed up as:

The less the value of pK_a, the more the  K_a is and the more the acid dissociates and the more the stronger is the acid.

Given,

pK_a of acetic acid = 54.7

pK_a of benzoic acid = 54.2

pK_a of benzoic acid < pK_a of acetic acid

So, benzoic acid is the stronger acid.

You might be interested in
Given 16.2 grams of substance Y, if the substance absorbs 2722 joules of energy and the specific heat of the substance is 9.22 J
snow_tiger [21]
Since the substance absorbs heat, it is expected that the temperature will rise. The formula for the internal energy of a substance is given by the equation:

ΔU = mCpΔT

where:

ΔU = internal energy
m = mass of substance
Cp = specific heat capacity of substance
ΔT = change in temperature

ΔU = 2722 Joules = 16.2 grams (9.22 J/g-°C) (Tf - 26°C)

This gives a final temperature of Tf = 44.22 °C
4 0
3 years ago
How many millimeters are there in 5.12 x 10^5
Anton [14]

Answer:

5.12x10¹¹ millimeters

Explanation:

Milli is a prefix used in science and engineering to decribe the number as the exponent x10⁻³. In the prefix kilo, the number is at the exponent x10³.

5.12x10⁵ kilometers are:

5.12x10⁵ kilometers * (1000m / 1km) = 5.12x10⁸ meters

5.12x10² meters * (1m / 1000millimeters) = 5.12x10¹¹ millimeters

8 0
3 years ago
The unfolding of a protein by heat or chemical treatment is referred to as
aksik [14]

Answer:

14

Explanation:

6 0
3 years ago
Read 2 more answers
Legend says that archimedes, in determining whether or not the king's crown was made of pure gold, measured its volume by the wa
amm1812
Mass=volume x density
if we have mass and density we can calculate volume using the formula: volume=mass/density
volume of the displaced water = 600g/19.3g/cm3
volume = 31.09cm3
6 0
3 years ago
What element in magma is most abundant
pishuonlain [190]
Oxygen :) hope it helped
6 0
3 years ago
Read 2 more answers
Other questions:
  • What does the octet rule state that explains why atoms bond
    9·2 answers
  • Which of the following could result from the fission of carbon?
    6·1 answer
  • What happens when magnesium reacts with dilute acid?
    11·1 answer
  • Sodium metal reacts with chlorine gas to produce sodium chloride. What mass (grams) of sodium metal would be needed to fully rea
    11·1 answer
  • If 251 mL of 6.0 M H2SO4 is diluted to 500. mL, what is its new molarity?
    7·1 answer
  • Which one of these are correct?
    11·1 answer
  • What charge will an ion of phosphorus form?
    8·2 answers
  • An atom of oxygen has six valence electrons. In nature, oxygen is a diatomic molecule and is usually found in the form O2. Why w
    6·1 answer
  • Suppose Earth was tilted much less on its axis. What effect would this have on the planet? Please help me !
    14·1 answer
  • Fizzing or foaming is evidence that a chemical change may have occured
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!