Science
Chemistry Q&A Library

The active ingredient in aspirin is acetylsalicylic acid. A 2.08 g sample of acetylsalicylic acid required 23.06 mL of 0.5007 M NaOH for complete reaction. Addition of 13.02 mL of 0.4434 M HCl to the flask containing the aspirin and the sodium hydroxide produced a mixture with pH = 3.48. Find the molar mass (in g/mol) of acetylsalicylic acid and its Ka value. Acetylsalicylic acid is a monoprotic acid.

Question

Asked Dec 3, 2019

471 views

The active ingredient in aspirin is acetylsalicylic acid. A 2.08 g sample of acetylsalicylic acid required 23.06 mL of 0.5007 M NaOH for complete reaction. Addition of 13.02 mL of 0.4434 M HCl to the flask containing the aspirin and the sodium hydroxide produced a mixture with pH = 3.48. Find the molar mass (in g/mol) of acetylsalicylic acid and its K_a value. Acetylsalicylic acid is a monoprotic acid.

Expert Answer

Step 1

Number of moles of acetylsalicylic acid and NaOH will be equal since one carboxylic acid group is present in acetylsalicylic acid.

No.of moles
Molarity=
Volume(L)
No.of moles of NaOH=Molarity×Volume(L)
=0.5007M×0.02306L
=0.01155mol
No.of moles of acetylsalicylic acid = 0.01155mol
mass
Molar mass=.
No.of moles
2.08g
0.01155mol — Image Transcription
No.of moles Molarity= Volume(L) No.of moles of NaOH=Molarity×Volume(L) =0.5007M×0.02306L =0.01155mol No.of moles of acetylsalicylic acid = 0.01155mol mass Molar mass=. No.of moles 2.08g 0.01155mol

Step 2

Number of moles of HCl can be determin...

No.of moles
Molarity=-
Volume(L)
No.of moles of HC1=Molarity×Volume(L)
=0.4434M×0.01302L
=0.00577mol
No.of moles of salt of resulting solution=0.01155-0.00577
=0.00578 mol — Image Transcription
No.of moles Molarity=- Volume(L) No.of moles of HC1=Molarity×Volume(L) =0.4434M×0.01302L =0.00577mol No.of moles of salt of resulting solution=0.01155-0.00577 =0.00578 mol

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution

*Response times may vary by subject and question.

Tagged in

Science

Chemistry

General Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you

Show more Q&A

Q: Many common materials that we ingest, though quite safe in reasonable quantities, become toxic when ...

A: Click to see the answer

Q: A 8.22-g sample of solid calcium reacted in excess fluorine gas to give a 16g sample of pure solid C...

A: The formula for the enthalpy formation is followign bellow:

Q: A system initially at 1.50L changes its volume under an external pressure of 0.988atm while absorbin...

A: Given data:

Q: What happens if you add heat to an exothermic reaction?

A: An exothermic reaction generates heat. if we add more heat, its temperature increases. For an exothe...

Q: What pressure does the gas exert if the temperature changes from T1 = 600. K to T1 = 300. K, while t...

A: According to Gay-Lussac's law, at constant volume pressure increases, temperature increases.

Q: What is the chemical composition of DNA?

A: DNA: Deoxyribonucleic acidDNA is a molecule composed of two chains that coil around each other to fo...

Q: Consider the reaction: 2Cl2 + PCl = PCl5 --> What is the name of PCl5? --> If you react...

A: The given compound has one Phosphorous and five Chlorine atoms.Chemical name for PCl5 is Phosphorus ...

Q: 4. IBr decomposes according to the reaction at 150 C: 2 IBr (g) I2 (g) + Br2 (g) 11 If IBr is placed...

A: Given:Kc = 0.0025.Initial moles of N2 = 1.00 mol.Initial moles of O2 = 1.00 mol.Volume of solution =...

Q: If you have7.93 x 1022 molecules of Ne2 gas. How many g do you have ?

A: The number of molecules of Ne2 gas is 7.93×1022. The formula to calculate number of molecules is,

ScienceChemistryQ&A Library