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
Lelu [443]
3 years ago
5

Aspirin (C9H8O4) is an acid which can be titrated with a base to determine purity. If an aspirin tablet weighing 0.615 g is titr

ated with standardized 0.1121 M KOH, the endpoint is reached after 20.52 mL of KOH have been added. What is the percentage of aspirin in the tablet
Chemistry
1 answer:
Iteru [2.4K]3 years ago
6 0

Answer:

67.4 % of C₉H₈O₄

Explanation:

To make titrations problems we know, that in the endpoint:

mmoles of acid = mmoles of base

mmoles = M . volume so:

mmoles of acid = 20.52 mL . 0.1121 M

mmoles of acid = mg of acid / PM (mg /mmoles)

Let's determine the PM of aspirin:

12.017 g/m . 9 + 1.00078 g/m . 8 + 15.9994 g/m . 4 = 180.1568 mg/mmol

mass (mg) = (20.52 mL . 0.1121 M) . 180.1568 mg/mmol

mass (mg) = 414.4 mg

We convert the mass to g → 414.4 mg . 1g / 1000mg = 0.4144 g

We determine the % → (0.4144 g / 0.615 g) . 100 = 67.4 %

You might be interested in
how does the kinetic energy of a substance's particle in the solid phase compare to their kinetic enegy in the liquid phase?​
iVinArrow [24]
The kinetic energy in the solid and liquid phases is the same. The kinetic energy of the substance's particles will depend on the volume of the substance. The particles have less kinetic energy in the liquid phase than they do in the gas phase. ... They vibrate so quickly that the particles ionize and become plasma.

vote brainliest if this helped! :)
3 0
4 years ago
In the compound AbO3, the ratio of aluminum to<br> oxygen is
jasenka [17]
The compound is Al2O3. The ratio of aluminum to oxygen is 2:3.
3 0
3 years ago
Efforts to restore wetlands and forests along the coast will most likely _______.
Nataly [62]

The question is incomplete, the complete question is;

Efforts to restore wetlands and forests along the coast will most likely _______. a. benefit the economy by providing jobs b. improve wildlife populations c. reduce soil erosion and flooding in coastal areas d. all of the above

Answer:

ALL OF THE ABOVE.

Explanation:

If wetlands and forests are restored, timber workers will be in business and farmers who cultivate crops on wetlands will have jobs. Thus restoring forests and wetlands could create new jobs.

Also, with the restoration of forests, wild life population will improve because their habitat has been restored. Similarly, the forest trees will contribute to curbing menaces caused by erosion and flooding in coastal areas since trees naturally reduces the speed of surface runoff and wind.

7 0
3 years ago
A 250 mL beaker is submerged in a large container of Liquid X and turned upside down, and another 250 mL beaker is submerged and
vovangra [49]

Answer:

Mx will be less than My.

Explanation:

The correct option is - Mx will be less than My.

Because, liquid X have been higher viscosity and vapor pressure than liquid B.

Vapor pressure of liquid A is greater, so the amount of liquid X will vaporized greater and H2 gas has been displaced greater from the beaker as compared to liquid Y.

The amount of H2 in liquid Y remains greater in beaker as compared to liquid X.

So, Mx will be less than My.

4 0
3 years ago
How many valence electrons are found in gallium? 3 5 7 8
ivanzaharov [21]
3 valence electrons
5 0
3 years ago
Read 2 more answers
Other questions:
  • If you mix a typical aluminum ion (al, atomic no. = 13) with a typical oxygen ion (o, atomic no. = 8), what compound is formed?
    9·1 answer
  • When an aqueous solution of magnesium nitrate is mixed with an aqueous solution of potassium carbonat?
    8·1 answer
  • Baking soda has a pH of 9, and household ammonia has a pH of 12. This means that ammonia is ____ times more basic than baking so
    6·1 answer
  • One example of a system or function only controlled by the sympathetic nervous system where the molecules act as hormones is the
    12·1 answer
  • match the number of negative charges to the number of positive charges to make each combination balanced (see image for answer)
    6·1 answer
  • Define significant figure. Discuss the importance of using the proper number of significant figures in measurements and calculat
    11·1 answer
  • Which of the following is the best definition of nuclear fission?
    12·2 answers
  • Explain why methyl propyl ether forms both methyl iodide and propyl iodide when it is heated with excess HI.
    9·1 answer
  • Have some points chemistry gang RISE UP
    10·2 answers
  • PLS HELP! BRAINLIEST IF RIGHT WITH EXPLANATION :)
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!