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
PilotLPTM [1.2K]
3 years ago
6

The pH of a 1.4M solution of barbituric acid HC4H3N2O3 is measured to be 1.93. Calculate the acid dissociation constant Ka of ba

rbituric acid. Round your answer to 2 significant digits.
Chemistry
1 answer:
tiny-mole [99]3 years ago
6 0

Answer:

9.8 × 10⁻⁵

Explanation:

Let's consider the acid dissociation of barbituric acid.

HC₄H₃N₂O₃(aq) ⇄ C₄H₃N₂O₃⁻(aq) + H⁺(aq)

The pH is 1.93. We can find the concentration of H⁺.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -1.93 = 0.0117 M

The concentration of the acid (Ca) is 1.4 M. We can fidn the acid dissociation constant (Ka) using the following expression.

[H⁺] = √(Ca × Ka)

[H⁺]² = Ca × Ka

Ka = [H⁺]² / Ca

Ka = (0.0117)² / 1.4

Ka = 9.8 × 10⁻⁵

You might be interested in
What does fossil mean in my own words
Nataliya [291]

Answer: A thing that died a long time ago, and it's bones were preserved in the ground.

Explanation:

Because yes

6 0
3 years ago
An increase in greenhouse gases results in?​
grin007 [14]
An increase in the atmospheric concentrations of greenhouse gases produces a positive climate forcing, or warming effect. From 1990 to 2015, the total warming effect from greenhouse gases added by humans to the Earth's atmosphere increased by 37 percent.
5 0
3 years ago
Balance this equation: Al+ HNO3 ---- H2 + Al(NO3)3​
romanna [79]

Answer:

2Al+ 6HNO3 ---- 3H2 + 2Al(NO3)3​

Explanation:

Put coefficient a,b,c, and d for calculation:

a Al + b HNO3 = c H2 + d Al(NO3)3

for Al: a = d

for H: b = 2c

for N: b = 3d

for O: 3b = 9d

Suppose a=1, then d=1, b=3, c=3/2

multiply 2 to make all natural number, a=2, then b=6, c=3, d=2

6 0
3 years ago
How many sodium atoms will create an ionic bond with sulfur?
Galina-37 [17]
Hi,

Two sodium atoms are needed to create an ionic bond with sulfur. 
5 0
3 years ago
Which of the following is NOT true of white dwarfs?
liq [111]

Answer:

A white dwarf is what stars like the Sun become after they have exhausted their nuclear fuel. Near the end of its nuclear burning stage, this type of star expels most of its outer material, creating a planetary nebula. Only the hot core of the star remains. ... That means a white dwarf is 200,000 times as dense.

Explanation:

they are cold

they are about the size of Earth

these both are not true

6 0
3 years ago
Read 2 more answers
Other questions:
  • An unknown substance can be identified by
    9·1 answer
  • What are the three steps scientist take to evaluate a scientific explanation
    8·1 answer
  • Predict the following reaction<br> Kl+Pb(NO3)2-&gt;?
    11·1 answer
  • What group of professionals specialize in designing, testing, and building the products of technology?
    14·1 answer
  • Give the answer to the problem below using the correct number of significant digits. (1.3 x 103) x (5.724 x 104)
    14·2 answers
  • Which of the following is formed when a barium atom achieves an octet?
    9·1 answer
  • Atoms of element X weigh 32 times more than atoms of element Y. A compound has the formula: XY2 The ratio of the mass of X to th
    14·1 answer
  • 13. Why are wind and solar power called renewable energy?<br> HELPP PLZ
    13·1 answer
  • A compound has a percent composition of 15.24% sodium (molar mass = 22.99
    11·1 answer
  • During what stage of the life cycle is an animal able to reproduce? (2 points) a Adolescent b Adult c Embryo d Infant
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!