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
Dvinal [7]
3 years ago
5

How many grams of sodium benzoate, C H CO Na, have to be added to 1.50 L of a 0.0200 M solution of benzoic acid, C H CO H, to ma

ke a buffer with a pH = 4.00, assuming no volume change?
Chemistry
1 answer:
Dmitrij [34]3 years ago
4 0

Answer: 2.8275grams

Explanation: A buffer is made btw a weak acid and it salt. In a solution made by dissolving a weak acid in solution, equilibrium is set up btw ionised and unionised ion. For Benzoic acid

C6H5COOH....> C6H5COO- + H+

Ka = [C6H5COO-] [H+]/ [C6H5COOH].......(1)

using Ka = 6.5× 10^-5, [C6H5COOH] = 0.02M. PH= - log[H+] ....> [H+]= 10^-4M.

Putting the values in(1)

[C6H5COO-]= 6.5× 10^-5 × 0.02/ 10^-4

[C6H5COO-] = 0.013M = Molarity of sodium benzoate

Mole(C6H5COONa) = 0.013 × Volume = 0.013mol/litre × 1.5 litre

Mole(C6H5COONa) = 0.0195mol

Mass(C6H5COONa) = 0.0195 × Molar mass

Mass(C6H5COONa) = 2.8275g

You might be interested in
Ozone(O3) number of atoms
spayn [35]
As the O3 suggests, the Ozone molecule is made up of 3 Oxygen atoms.
8 0
3 years ago
if the pressure on a 3.0 liter sample of gas is doubled at constant temperature, the new volume will be
BabaBlast [244]
The new volume is 6.0 leters

7 0
3 years ago
Read 2 more answers
What do waves carry from place to place​
mario62 [17]

Answer:

Waves carry energy from place to place.

Explanation:

Some waves are used for mainly communication and phone signals. They help people get internet in the middle of nowhere if you are near an energy wave.

3 0
3 years ago
What would be the IUPAC name of PoTs2
Vikentia [17]

Answer:

6-methylhept-1-en-3-one

Explanation:

6 0
3 years ago
What characteristic of rivers at their source gives them so much power to shape the land
Zielflug [23.3K]
River sources tend to be at the top of mountains or areas of high elevation. This means that rivers impact the entire terrain from mountains to seas and oceans.

I hope this Helps!
8 0
3 years ago
Other questions:
  • What item would you use to pour medium amounts of liquid
    8·1 answer
  • Consider two electrochemical reactions: A and B. Reaction A results in the transfer of 2 mol of electrons per mole of reactant a
    14·1 answer
  • The water for the pan is not saturated with co2. will the reported percent caco3 in the original sample be too high, too low, or
    14·1 answer
  • ExxonMobil uses a(n) _____ appeal when it explains technical aspects of its products, such as lithium ion batteries, hydrogen te
    9·1 answer
  • A) Calculate the standard free-energy change at 25 ∘C for the following reaction:
    12·1 answer
  • The main function of the respiratory system is to –
    13·2 answers
  • What can change depending on the number of protons in an atom?​
    12·2 answers
  • On the spectrum, which section has the longest wavelength and the shortest wavelength? (2 answers for this question)
    6·1 answer
  • Edge 2020, will give brainliest
    8·1 answer
  • One way to identify the type of radioactive decay produced in a reaction is to pass the emission through an electric field. Desc
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!