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
ivann1987 [24]
3 years ago
8

For 100.0 mL of a solution that is 0.040M CH3COOH and 0.010 M CH3COO, what would be the pH after adding 10.0 mL 50.0 mM HCl?

Chemistry
1 answer:
damaskus [11]3 years ago
3 0

Answer:

The pH of the buffer is 3.90

Explanation:

The mixture of a weak acid CH3COOH and its conjugate base CH3COO produce a buffer that follows the equation:

pH = pKa + log [A-] / [HA]

<em>Where pH is the pH of the buffer, pKa is the pKa of acetic acid (4.75), and [A-] could be taken as the moles of the conjugate base and [HA] the moles of thw weak acid.</em>

<em />

To solve this question we need to find the moles of the CH3COOH and CH3COO- after the reaction with HCl:

CH3COO- + HCl → CH3COOH + Cl-

<em>The moles of CH3COO- are its initial moles - the moles of HCl added</em>

<em>And moles of CH3COOH are its initial moles + moles HCl added</em>

<em />

Moles CH3COO-:

Initial moles  = 0.100L * (0.010mol / L) = 0.00100moles

Moles HCl = 0.010L * (0.050mol / L) = 0.000500 moles

Moles CH3COO- = 0.000500 moles

Moles CH3COOH:

Initial moles  = 0.100L * (0.040mol / L) = 0.00400moles

Moles HCl = 0.010L * (0.050mol / L) = 0.000500 moles

Moles CH3COO- = 0.003500 moles

pH is:

pH = 4.75 + log [0.000500] / [0.00350]

<em>pH = 3.90</em>

<em />

<h3>The pH of the buffer is 3.90</h3>
You might be interested in
A Herbig-Haro (HH) object is:_:_________.
Phoenix [80]

Given what we know about Herbig-Haro (HH) objects, we can confirm that they are born from the collision between a jet from a star and clouds of interstellar matter.

<h3>What are Herbig-Haro (HH) objects?</h3>
  • To put it simply, a Herbig-Haro (HH) object is what we observe as a bright spot in distant space. Upon closer observation we can observe that these giant bright patches are not lone objects, but in fact immense groups of interstellar matter.

<h3>How Herbig-Haro (HH) objects are formed.</h3>
  • The formation of one of these interstellar groups requires an <em><u>immense amount of energy</u></em>. This energy come from the speed at which the materials that form these objects collide.
  • As stated in the question, the jet released from a star in the process of being born <em><u>smashes into a giant cloud of </u></em><em><u>dust </u></em><em><u>and </u></em><em><u>interstellar material </u></em><em><u>to form the </u></em><em><u>Herbig</u></em><em><u>-</u></em><em><u>Haro </u></em><em><u>(HH) </u></em><em><u>objects</u></em>.
  • This collision happens at hundreds of km/s. To put it into perspective, it would be roughly 500,000 miles per hour.

Therefore, we can confirm that option b, which states, "<em>where a jet from a </em><em>star </em><em>in the process of being born </em><em>collides </em><em>with (and lights up) a nearby cloud of </em><em>interstellar matter</em>", is the correct choice for the question pertaining to Herbig-Haro (HH) objects.

To learn more about interstellar space visit:

brainly.com/question/7106246

5 0
2 years ago
Which of the following<br> are hydrocarbons? Check all that apply.<br> A.<br> B.<br> C.<br> D.
lutik1710 [3]

Answer:

its B and D

Explanation:

other person is wrong.

3 0
3 years ago
Read 2 more answers
If you had 100 ml of juice, how many milliliter would de fruit juice?
Julli [10]
Since the measurement is not changing, the answer is 100 mL. Hope this helps.
8 0
3 years ago
What is the total number of moles of atoms in one mole of (NH4)2SO4? 1. 10 2. 11 3. 14 4. 15
Neporo4naja [7]

Answer:

4. 15

Explanation:

The given formula is:- (NH_4)_2SO_4

1 mole of the salt contains 2 moles of nitrogen atom, 8 moles of hydrogen, 1 mole of sulfur and 4 moles of oxygen atom as can be seen from the formula.

Thus,

1 mole of salt contains total of 15 moles of the atoms which constitute the salt.

<u>Hence, 4. is the answer.</u>

5 0
3 years ago
Read 2 more answers
Describe the quantitative characteristics of all chemical reactions. Explain how we can use these features to make quantitative
san4es73 [151]
Answer Chemical reaction quantitatively depend on the reactant and product molecule
3 0
2 years ago
Other questions:
  • Bruce left some butter out in his kitchen. Bright sunlight came in through the window and melted the butter. Heat energy from th
    12·2 answers
  • A medium-sized banana (118g) on average contains 422 mg of potassium - a nutrient needed to maintain fluid balance. If someone e
    5·1 answer
  • On Earth, the mass of one of the lunar landing modules used to explore the moon was measured to be about 4,200 kg. The accelerat
    7·2 answers
  • 1. What is energy measured in? 2. What should you consider when choosing which food you eat each day? 3. Name some energy stores
    15·1 answer
  • Match the element with its number of valence electrons. Column A 1. Boron : Boron 2. Carbon : Carbon 3. Fluorine : Fluorine 4. S
    13·1 answer
  • For each chemical reaction, fill in the exponents in the formula for Ks
    9·1 answer
  • Decribe the difference between and climate.
    14·1 answer
  • Determine the number of Au atoms found in 5.18 grams of gold.
    14·1 answer
  • Fill in the blank answers please help.
    10·1 answer
  • All simple metal with acid reactions are ____ displacement reactions.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!