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
Harlamova29_29 [7]
3 years ago
8

Calculate the pH of a buffer solution prepared by mixing 60.0 mL of 1.00 M lactic acid and 25.0 mL of 1.00 M sodium lactate.

Chemistry
1 answer:
marshall27 [118]3 years ago
4 0
This problem could be solved easily using the Henderson-Hasselbach equation used for preparing buffer solutions. The equation is written below:

pH = pKa + log[(salt/acid]

Where salt represents the molarity of salt (sodium lactate), while acid is the molarity of acid (lactic acid). 

Moles of salt = 1 mol/L * 25 mL * 1 L/1000 mL = 0.025 moles salt
Moles of acid = 1 mol/L* 60 mL * 1 L/1000 mL = 0.06 moles acid
Total Volume = (25 mL + 60 mL)*(1 L/1000 mL) = 0.085 L

Molarity of salt = 0.025 mol/0.085 L = 0.29412 M
Molarity of acid = 0.06 mol/0.085 L = 0.70588 M

Thus,
pH = 3.86 + log(0.29412/0.70588)
pH = 3.48
You might be interested in
Which two objects would experience the greatest gravitational force between
Naily [24]

Answer:

D

Explanation:

The greater the distance apart, the lesser the gravitational force between the objects

3 0
3 years ago
Read 2 more answers
14. What is the pH of a 0.24 M solution of sodium propionate, NaC3H502, at 25°C? (For
Murrr4er [49]

Answer:

9.1

Explanation:

Step 1: Calculate the basic dissociation constant of propionate ion (Kb)

Sodium propionate is a strong electrolyte that dissociates according to the following equation.

NaC₃H₅O₂ ⇒ Na⁺ + C₃H₅O₂⁻

Propionate is the conjugate base of propionic acid according to the following equation.

C₃H₅O₂⁻ + H₂O ⇄ HC₃H₅O₂ + OH⁻

We can calculate Kb for propionate using the following expression.

Ka × Kb = Kw

Kb = Kw/Ka = 1.0 × 10⁻¹⁴/1.3 × 10⁻⁵ = 7.7 × 10⁻¹⁰

Step 2: Calculate the concentration of OH⁻

The concentration of the base (Cb) is 0.24 M. We can calculate [OH⁻] using the following expression.

[OH⁻] = √(Kb × Cb) = √(7.7 × 10⁻¹⁰ × 0.24) = 1.4 × 10⁻⁵ M

Step 3: Calculate the concentration of H⁺

We will use the following expression.

Kw = [H⁺] × [OH⁻]

[H⁺] = Kw/[OH⁻] = 1.0 × 10⁻¹⁴/1.4 × 10⁻⁵ = 7.1 × 10⁻¹⁰ M

Step 4: Calculate the pH of the solution

We will use the definition of pH.

pH = -log [H⁺] = -log 7.1 × 10⁻¹⁰ = 9.1

5 0
3 years ago
What is the hydridization of TeBr4
Debora [2.8K]
It's sp3d according to the lewis dot structure (four bonds, one lone pair).
5 0
3 years ago
What is a small description of a atom
steposvetlana [31]

Answer:

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. ... The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

4 0
3 years ago
Read 2 more answers
On the seashore pebbles that are rough and uneven become smooth and rounded explain how they become smooth and rounded
Andru [333]
The pebbles become smooth and even because of erosion. the waves from the sea rub against the pebbles this is erosion. x
7 0
3 years ago
Other questions:
  • Name the following organic compounds.
    5·1 answer
  • What is mass transfer?
    12·1 answer
  • Hope is testing a substance using blue litmus paper. The paper turns red. The substance is _____.
    8·2 answers
  • A baker places a paper cone into the center of a fruit pie before putting the pie in the oven. Explain why this would keep juice
    10·1 answer
  • A 4.000 g sample of iron was heated from 0.0°C to 21.0°C. If it has a specific heat of 0.440 kJ/kg °C, how many kilojoules of he
    5·1 answer
  • Write the electron configuration for the element titanium, TiTi. Express your answer in order of increasing orbital energy as a
    7·1 answer
  • A chemical engineer must report the average volume of a certain pollutant produced by the plants under her supervision. Here are
    10·1 answer
  • 1)Water takes this form above 100c (solid, liquid or gas)
    15·1 answer
  • Which isoelectronic series is correctly arranged in order of increasing radius?.
    11·1 answer
  • Given the balanced equation representing a
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!