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]
4 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]4 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
PLZ HELP Organisms on earth are ________ based life forms.<br> - oxygen<br> - hydrogen<br> - carbon
Bess [88]

Answer:

Carbon based life forms

5 0
3 years ago
Read 2 more answers
If a compound contains a poly atomic ion then what type of compound is it A. Convalent Compound B. Ionic Compound
den301095 [7]

Answer:

B. Ionic Compound

Explanation:

An ionic compound is that compound which contains a positively charged ion called CATION and a negatively charged ion called ANION. The cation loses or transfers electrons to the anion, hence, making the former (cation) positive and the latter (anion) negative.

A polyatomic ion is an ion that contains more than one type of atom e.g OH-, NO3²-, CO3²- etc. A polyatomic ion usually has an overall charge formed from the charges of the individual atoms that makes it up. For example, in OH-, the overall charge is -1.

Since a polyatomic ion can have an overall positive or negative charge, it must enter a reaction with another ion that complements it i.e. a negative polyatomic ion will react with a positive ion to neutralize its charge. Hence, this forms an IONIC COMPOUND. This is why most compounds with polyatomic ions are IONIC COMPOUNDS.

For example, CaCO3 is an ionic compound formed when Ca²+ (cation) reacts with the polyatomic anion: CO3²-

5 0
3 years ago
What do dipole-dipole forces do?
g100num [7]
An ion-dipole force is a type of intermolecular force in which forces of attraction or repulsion occur between neighboring ions, molecules or atoms.
3 0
3 years ago
Read 2 more answers
Write two reactions showing nascent Hydrogen is more reactive than<br> molecular Hydrogen.
ratelena [41]

Answer:

1.) Nascent Hydrogen has more energy than Molecular Hydrogen.

2.) Nascent Hydrogen is are more on the side of atomic and since atoms are more active than molecules, Nascent Hydrogen becomes more reactive.

4 0
3 years ago
Identify whether the following example is qualitative or quantitative data.
OLga [1]
I think that it is qualitative data
8 0
3 years ago
Other questions:
  • So my science teacher says if you put water in a cup and then put oil in it the oil is "more dense than water" witch means the o
    13·2 answers
  • The _______ are found on the left side of the arrow in a chemical reaction.
    8·1 answer
  • An ice cute at 0.0*C was dropped into 30.0 g of water in a
    15·1 answer
  • How many moles of SO3 are in 2.4x10^24 molesculea of SO3
    11·1 answer
  • The smallest atoms can themselves exhibit quantum-mechanical behavior. Calculate the de Broglie wavelength (in picometers) of a
    12·1 answer
  • When a crystal of sugar dissolves in water, what happens to the entropy?
    14·1 answer
  • When energy changes forms there is always some thermal energy that is produced that cannot be used. what type of energy is it?
    6·1 answer
  • **PLEASE HELP** If you were presented with a preserved brain specimen, but weren’t told whether it was from a human or a sheep,
    6·1 answer
  • How many molecules are in 0.73 mol of C12H22011? *
    5·1 answer
  • PLEASE HELP ME NOW! WHATS NEWTONS FIRST LAW?!!!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!