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
Marrrta [24]
3 years ago
7

What mass of NaC6H5COO should be added to 1.5 L of 0.40 M C6H5COOH solution at 25 °C to produce a solution with a pH of 3.87 giv

en that the Ka of C6H5COOH is 6.5×10-5 and the molar mass of NaC6H5COO is 144.1032 g/mol?
Chemistry
1 answer:
statuscvo [17]3 years ago
7 0

Answer:

41 g

Explanation:

We have a buffer formed by a weak acid (C₆H₅COOH) and its conjugate base (C₆H₅COO⁻ coming from NaC₆H₅COO). We can find the concentration of C₆H₅COO⁻ (and therefore of NaC₆H₅COO) using the Henderson-Hasselbach equation.

pH = pKa + log [C₆H₅COO⁻]/[C₆H₅COOH]

pH - pKa = log [C₆H₅COO⁻] - log [C₆H₅COOH]

log [C₆H₅COO⁻] = pH - pKa + log [C₆H₅COOH]

log [C₆H₅COO⁻] = 3.87 - (-log 6.5 × 10⁻⁵) + log 0.40

[C₆H₅COO⁻] = [NaC₆H₅COO] = 0.19 M

We can find the mass of NaC₆H₅COO using the following expression.

M = mass NaC₆H₅COO / molar mass NaC₆H₅COO × liters of solution

mass NaC₆H₅COO = M × molar mass NaC₆H₅COO × liters of solution

mass NaC₆H₅COO = 0.19 mol/L × 144.1032 g/mol × 1.5 L

mass NaC₆H₅COO = 41 g

You might be interested in
The graph below shows the volume and the mass of four different substances at STP.
sladkih [1.3K]
The formula of density is mass / volume

This means that
- high mass, low volume = high density
- high mass, high volume = so-so
- low mass, high volume = low density

From the graph shown, 
D has the lowest density because it has low mass yet high volume.
6 0
3 years ago
If the pressure of 50.0 mL of oxygen gas at 100°C increases from 735 mm Hg to 925 mm Hg, what is
laila [671]

Answer: .039L

Explanation:

8 0
2 years ago
For the reaction of sodium bromide with chlorine gas
lina2011 [118]

The reaction of sodium bromide with chlorine gas is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

<h3>What is sodium bromide?</h3>

Sodium bromide is an inorganic compound, white, crystalline with high melting point.

The reaction between halogens is redox reaction

Oxidation  – 2Br⁻ ? Br₂ + 2e⁻ loss of electron.

Reduction – Cl₂ + 2e⁻ ? 2Cl⁻ gains of electron.

Thus, the correct option is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

Learn more about sodium bromide

brainly.com/question/15409724

#SPJ4

7 0
1 year ago
Pls answer the first one pls I’m begging you my teachers insane
Len [333]

Explanation:

it might not be completely right

3 0
2 years ago
What is created when two different reactions come together
iragen [17]

Answer:

Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules

8 0
3 years ago
Other questions:
  • A mass of 3.6g of magnesium reacts in excess chlorine to form a chloride, if the mass of the chloride is 14.25g, find the formul
    9·1 answer
  • Read the information in the table below:
    14·2 answers
  • Why is BrCl5 nonpolar when it's Asymmetrical? Aren't symmetrical molecules suppposed to be polar?
    12·2 answers
  • Which change occurs when a barium atom loses two electrons?(1) It becomes a negative ion and its radius decreases.(2) It becomes
    14·2 answers
  • Magnesium and nitrogen react in a combination reaction to produce magnesium nitride. 3 mg + n2 ? mg3n2. in a particular experime
    5·1 answer
  • Why do we not currently use more renewable energy in the U. S. ​
    12·2 answers
  • Express as ordinary numbers. 6.02 x 109 =
    15·1 answer
  • How can we obtain Salicyaldehyde? Give reactions also
    14·1 answer
  • 2-- What is the [H3O+] in a solution with [OH-] = 1 x 10-12 M?<br>​
    9·1 answer
  • Anyone know who Selena Quinten is??????????
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!