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
Slav-nsk [51]
3 years ago
6

A solution prepared by dissolving 0.100 mole of propionic acid in enough water to make 1.00 L of solution is observed to have a

pH = 2.94. What is the Ka for propionic acid?(A) 1.3 x 10¯6(B) 1.1 x 10¯3(C) 1.3 x 10¯5(D) 1.1 x 10¯2
Chemistry
1 answer:
torisob [31]3 years ago
4 0

Answer:

C) k_a=1.3\times 10^{-5}

Explanation:

pH is defined as the negative logarithm of the concentration of hydrogen ions.

Thus,  

pH = - log [H⁺]

The expression of the pH of the calculation of weak acid is:-

pH=-log(\sqrt{k_a\times C})

Where, C is the concentration = 0.5 M

Given, pH = 2.94

Moles = 0.100 moles

Volume = 1.00 L

So, Molarity=\frac{Moles}{Volume}=\frac{0.100}{1.00}\ M=0.100\ M

C = 0.100 M

2.94=-log(\sqrt{k_a\times 0.100})

\log _{10}\left(\sqrt{k_a0.1}\right)=-2.94

\sqrt{0.1}\sqrt{k_a}=\frac{1}{10^{2.94}}

k_a=1.3\times 10^{-5}

You might be interested in
1 point
Bumek [7]

Answer:

1 mole of C2H6.

Explanation:

The balanced equation for the reaction is given below:

2C2H6 + 7O2 —> 4CO2 + 6H2O

We can determine the number of mole of C2H6 that reacted to produce 2 moles of CO2 as follow:

From the balanced equation above,

2 moles of C2H6 reacted to produce 4 moles of CO2.

Therefore, Xmol of C2H6 will react to produce 2 moles of CO2 i.e

Xmol of CO2 = (2 x 2)/4

Xmol of CO2 = 1 mole.

Therefore, 1 mole of C2H6 is required to produce 2 moles of CO2.

6 0
3 years ago
answer the following: a. Explain how a pulley changes the amount of force needed to lift an object. b. do all pulleys change the
Natalija [7]
<span> If you want to lift something that weighs 100kg, you have to pull down with a force equivalent to 100kg, which is 1000N (newtons). I hope this helps, please mark brainiest if it does. I will attach a picture I found off the internet to further help you  :)
(There are like 1,000,000,000,000,000,000,000 other ways I could have put that, to make it sound less creepy, I could just edit it now instead of writing this huge thing... oh well lol)
</span>
8 0
3 years ago
Does sound travel faster in a warm room or a cold room? Explain your answer.
RUDIKE [14]

Answer:

Explanation:

Sound travels outwards from the source in all directions. So there you have it sound does travel faster in warm air BUT it may appear to travel farther in cold air. This is how that works……if the air close to the ground is colder than the air above it then sound waves travelling upwards will be bent downwards.

4 0
3 years ago
Read 2 more answers
A sample of basalt has smaller crystals than a sample of granite. What is the most likely reason for this?
posledela
The most likely reason is that basalt is an extrusive rock, while granite is an intrusive rock. What this means is that basalt forms at the surface of the earth, where temperatures are cooler. Because of the cooler external temperature, basalt cools relatively quickly, and there isn't as much time for mineral crystals within the rock to align to form larger crystals while the rock is cooling. Granite, on the other hand, forms below the surface of the earth, where temperatures are significantly higher. Therefore, it doesn't cool as quickly, and the minerals within granite have more time to form larger crystals and the rock cools.
4 0
3 years ago
In Ionic compounds,metals____ valence electrons and nonmetals_____ valence electron
LuckyWell [14K]

Answer:

bf v

Explanation:

bgf

5 0
2 years ago
Other questions:
  • The following characteristics describe which of these terms? The substance is mixed uniformly throughout and each part of the su
    8·2 answers
  • Been struggling with this question for a while, some help will be appreciated :)
    5·1 answer
  • as the temperature on a sample of gas with a constant volume increases, the pressure _____. decreases stays the same increases
    15·1 answer
  • Identify the large brown tectonic plate and whether it is oceanic or continental.
    12·2 answers
  • In cells,____ are proteins that are needed to lower the amount of energy required to start chemical reactions.
    9·2 answers
  • 1. Or what is the steering of a vehicle an example?
    11·1 answer
  • Next
    6·1 answer
  • At a certain temperature, the solubility of zinc(I) chromate is (7.0x10^-5) M. What is the Ksp?
    8·1 answer
  • The pH of an unknown strong acid is 2. What<br> is the hydronium ion concentration?
    7·1 answer
  • you have been observing an insect that defends itself from enemies by secreting a caustic liquid. analysis of the liquid shows i
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!