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
boyakko [2]
3 years ago
8

A potassium permanganate solution is prepared by dissolving 22.14g of KMnO4 in water and diluting to a total volume of 1.000 L.

A total of 20.50 mL of this solution is required to reach the endpoint in a titration of a 200.0-mL sample containing H2C2O4(aq). Determine the concentration of H2C2O4 in the original solution. _________M
Chemistry
1 answer:
gladu [14]3 years ago
4 0

Answer:

The concentration of H₂C₂O₄ is 7,1800x10⁻³ M

Explanation:

The reaction of the titration is:

2 KMnO₄ + H₂C₂O₄ → 2 CO₂ + K₂O + 2 MnO₃ + H₂O

22.14g of KMnO₄ in 1,00L of water have a molarity of:

22,14g KMnO₄/L×\frac{1mol}{158,034g} = 0,14 M of KMnO₄

The moles you required for a complete reaction are:

0,14 mol KMnO₄/L× 0,02050L = 2,872x10⁻³ mol KMnO₄

By the reaction 2 moles of KMnO₄ reacts with 1 mole of H₂C₂O₄, thus, the moles of H₂C₂O₄ that react were:

2,872x10⁻³ mol KMnO₄×\frac{1mol H_{2}C_{2}O_{4}}{2molKMnO_{4}} = 1,436x10⁻³ moles of H₂C₂O₄

As the volume of the sample was 200,0mL≡ 0,2000L, The concentration of H₂C₂O₄ is:

\frac{1,436x10^{-3} mol}{0,2000L} = <em>7,1800x10⁻³ M</em>

<em />

I hope it helps!

You might be interested in
34.969amu)(0.7577) =<br> (36.966amu)(0.2423)
Natasha_Volkova [10]

Answer:

26.4960 is the answer for the first one

8.9569 is the answer for the second one

3 0
3 years ago
Upon heating a copper sample will expand, leading to a lower density? <br><br>A) True<br>B) False
Leona [35]

Answer;

The above statement is true

upon heating a copper sample will expand, leading to a lower density

Explanation;

-The density of solids decreased with increase in temperature and vice versa. The increase in temperature causes the volume of the solid to increase which as a result decreases the density as Density=Mass/Volume. The temperature of a body is the average kinetic energy of the molecules present in it.

In other words; The temperature of a body is the average kinetic energy of the molecules present in it. Therefore; when heat is supplied ( or temperature is increased) the average kinetic energy increases which increases the volume and thus density decreases.

8 0
3 years ago
Useful:<br>Harmful:<br>2. Give an example of how Bacteria can be useful and harmful to man.​
kupik [55]

Answer:

normal flora useful

Explanation:

protect the skin

5 0
3 years ago
Hello people ~<br>Help me with this question.<br>Thanks in advance!​
Alekssandra [29.7K]

Hello!

The pollution due to oxides of sulfur gets enhanced due to the

presence of :

  • (a) particulate matter
  • (b) ozone
  • (d) hydrogen peroxide

∴ The correct option is : <u>(4) (a),(b),(d) only</u>

3 0
2 years ago
Gasoline has a density of 0.7197 grams per milliliter. Calculate the mass, in grams, of a sample of gasoline with a volume of 48
barxatty [35]

Answer:

34.9103 or 34.9 g

Explanation:

Remember Density is a broken heart: m/v.

In this scenario (Let x = # of grams in the sample of gasoline),

D = 0.7198 g/mL = x g / 48.5 mL

So,

(0.7198 g/mL) * (48.5 mL) = x g

x g = 34.9103 = 34.9 g (Accounting for Significant Figures)

8 0
2 years ago
Other questions:
  • by definition, any substance that donates a proton is best defined as _________. a. an arrhenius acid b. an arrhenius base c. a
    14·1 answer
  • How is chemistry apart of daily routine
    13·1 answer
  • Compare and contrast the positive and negative effects that result from the use of the Haber process.
    12·1 answer
  • A/an __ is a type of mass movement that occurs when a thin block of soil, rock, and debris separates from the underlying bedrock
    6·1 answer
  • Please i need help ​
    11·1 answer
  • A student collects 350 mL of a vapor at a temperature of 67°C. The atmospheric pressure at the time of collection is 0.900 atm.
    13·1 answer
  • What is the relationship between grams and cm³? ​
    12·1 answer
  • What is the pH of a solution that<br> contains [H+]=3.18 x 10^-8 M?
    9·1 answer
  • If you help me, you are the best​
    15·1 answer
  • What form is the carbon prior to the lion eating the giraffe?*
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!