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
Ksenya-84 [330]
3 years ago
9

At pH= 8, which species is most likely to predominate in solution? pKa (-NH3+) = 9.9, pKa (-COOH) = 2.3

Chemistry
1 answer:
PtichkaEL [24]3 years ago
7 0

Answer:

The NH3 + with a PKa = 9.9

Explanation:

The Pka is a mathematical expression to express the dissociation grade of a substance in a solution, that means with a substance with a pKa small is a strong acid, and in this case since the solution pH is 8, that mean that the substance with high pKa ( lower acid strength)  will predominate in a pH of 8.

You might be interested in
Part a use these data to calculate the heat of hydrogenation of buta-1,3-diene to butane. c4h6(g)+2h2(g)→c4h10(g)
Reptile [31]

<u>Answer:</u> The heat of hydrogenation of the reaction is coming out to be 234.2 kJ.

<u>Explanation:</u>

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as \Delta H

The equation used to calculate enthalpy change is of a reaction is:

\Delta H_{rxn}=\sum [n\times \Delta H_{(product)}]-\sum [n\times \Delta H_{(reactant)}]

For the given chemical reaction:

C_4H_6(g)+2H_2(g)\rightarrow C_4H_{10}(g)

The equation for the enthalpy change of the above reaction is:

\Delta H_{rxn}=[(1\times \Delta H_{(C_4H_{10})})]-[(1\times \Delta H_{(C_4H_6)})+(2\times \Delta H_{(H_2)})]

We are given:

\Delta H_{(C_4H_{10})}=-2877.6kJ/mol\\\Delta H_{(C_4H_6)}=-2540.2kJ/mol\\\Delta H_{(H_2)}=-285.8kJ/mol

Putting values in above equation, we get:

\Delta H_{rxn}=[(1\times (-2877.6))]-[(1\times (-2540.2))+(2\times (-285.8))]\\\\\Delta H_{rxn}=234.2J

Hence, the heat of hydrogenation of the reaction is coming out to be 234.2 kJ.

4 0
3 years ago
What do you think would happen if you had a very small amount of water in a glass and you
Ipatiy [6.2K]
If it was warn - hot water, i would say yes



the warm - hot water would dissolve because of the temperature
8 0
3 years ago
2A1 +3CL2, → 2AICI3 what is the reaction
DerKrebs [107]

Answer:

redox reaction

Explanation:

8 0
3 years ago
Read 2 more answers
A substance is made up of slow-moving particles that have very little space between them. Based on this information, what can mo
spin [16.1K]

Answer:

o

Explanation:

it is not a gas because the particles do not move freely it may be a liquid or a solid partly and mostly liquidized.

8 0
3 years ago
Is the following nuclear equation balanced?<br> 237 Np - He+233 AM
Flura [38]

Answer:

Yes

Explanation:

Np²³⁷   →  He⁴ + Am²³³

The given nuclear equation is balanced. Np²³⁷ undergoes alpha decay and produce alpha particle and Am²³³.

Properties of alpha radiation:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number 4 less than and atomic number 2 less than the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

6 0
3 years ago
Other questions:
  • Each of the following values was read on an instrument of measuring device. In each case the last digit was estimated. Tell what
    12·1 answer
  • Can someone help me solve all of these problems? (Will give brainliest and a heart)
    5·1 answer
  • What is the molarity of a barium hydroxide solution if 93.9 mL is completely titrated by 15.3 mL of 0.247 M sulfuric acid soluti
    6·1 answer
  • When a chemical is in the gaseous state, it has definite mass, but its shape is independent of the shape of the container in whi
    8·1 answer
  • Alice is fed through a gastric tube. She has developed a pressure wound and needs extra protein to support wound healing. The re
    15·2 answers
  • Monel metal is a corrosion-resistant copper-nickel alloy used in the electronics industry. A particular alloy with a density of
    10·1 answer
  • Im in the middle of a chem test and i literally have no clue what is happening
    8·1 answer
  • How many<br> How long does it take to go<br> from a new moon to a third<br> quarter?
    11·1 answer
  • 04. Which two methods can be used to separate a salt from its solution in water?
    9·2 answers
  • Which option is an example of a physical change? Question 3 options: baking bread burning paper cooking eggs cutting paper
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!