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
VLD [36.1K]
3 years ago
5

Acetic acid is a weak acid with a pKa of 4.76. What is the concentration of acetic acid in a buffer solution of 0.2M at pH 4.9.

Give your answer in M but as a numeral only to 3 decimal places.
Chemistry
1 answer:
masya89 [10]3 years ago
6 0

Answer:

0.084 M

Explanation:

Using the Henderson-Hasselbalch equation for a buffer ( a buffer is solution contain a weak acid and it conjugate base; the solution resist change in pH)

pH = pKa + log ( base/acid)

4.9 - 4.76 =log ( base / acid)

10^0.14 =  ( base / acid)

1.38 = (base / acid)

since there is 0.2 M in the buffer solution

the concentration of acid =  \frac{1}{(1+1.38)} × 0.2 = 0.084 M

You might be interested in
You have a saturated solution of BaSO4, a slightly soluble ionic compound. What happens if you add Ba(OH)2, NaNO3, and CuSO4 to
igomit [66]

Answer:

- Addition of Ba(OH)2: favors the formation of a precipitate.

- Undergo a chemical reaction forming soluble species.

- Addition of CuSO4 : favors the formation of a precipitate.

Explanation:

Hello,

In this case, since the dissociation reaction of barium sulfate is:

BaSO_4(s)\rightleftharpoons Ba^{2+}(aq)+SO_4^{2-}(aq)

We must analyze the effect of the common ion:

- By adding barium hydroxide, more barium ions will be added to the equilibrium system so the formation of solid barium sulfate will be favored (reaction shifts leftwards towards reactants).

- By adding sodium nitrate, the following reaction will undergo:

BaSO_4(s)+NaNO_3(aq)\rightarrow Ba(NO_3)_2(aq)+Na_2SO_4(aq)

So the precipitate will turn into other soluble species.

- By adding copper (II) sulfate, more sulfate ions will be added to the equilibrium system so the formation of solid barium sulfate will be favored (reaction shifts leftwards towards reactants).

All of this is supported by the Le Chatelier's principle.

Best regards.

7 0
2 years ago
What is the mass number of the isotope zinc – 65?<br><br> a.30<br> b.65<br> c.35<br> d.95
aliina [53]
Atomic mass <span>of zinc ( zn ) is 65 u

Answer B</span>
3 0
3 years ago
What is the purpose of doing a cell culture lab?
Anuta_ua [19.1K]

Answer:

Cell culture is one of the most important techniques in cellular and molecular biology since it provides a platform to investigate the biology, biochemistry, physiology (e.g., aging) and metabolism of wild-type cells and diseased cells.

8 0
2 years ago
A white crystalline salt conducts electricity when it is melted and when it dissolves in water.
sergeinik [125]

Answer: Option (a) is the correct answer.

Explanation:

Ionic salts are defined as the salts which tend to contain ionic bonds as there occurs transfer of electrons between its combining atoms.

So, when an ionic salt melts or it is dissolved in water then it will dissociate into its respective ions and as electricity is the flow of electrons or ions. Hence, this salt is then able to conduct electricity.

As covalent compounds are insoluble in water so, they do no dissociate into ions. Hence, they do not conduct electricity.

Similarly, metallic and network solids do not dissociate into ions either when melted or dissolved in water. Therefore, they also do not conduct electricity.

Thus, we can conclude that when a white crystalline salt conducts electricity when it is melted and when it dissolves in water then this bond is of ionic type.

7 0
3 years ago
Which is a major environmental concern for our oceans?
padilas [110]
Plastic pollution is the correct answer
3 0
2 years ago
Read 2 more answers
Other questions:
  • 24.0 mL of a 0.120 M Ca(OH)2 solution is required to titrate 160 mL of an HCl solution to its equivalence point. Find the moles
    10·2 answers
  • What element is used in light bulbs as a filament???? help rly need help
    8·1 answer
  • Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4nh3 + 5o2 → 4no + 6h2o when 40.0 g nh3 and 50.0 g o2
    12·1 answer
  • What is the molarity of a solution that contains 2.38 g of h2c2o4 * 2h2o in exactly 300 ml of solution?
    6·1 answer
  • Which substance is oxidized and which is reduced in this reaction?
    14·1 answer
  • What is the number of formula units in a 5.88 mol sample of Ca2O?
    10·1 answer
  • Calculate ΔH (in kJ) for the process Hg2Br2(s) → 2 Hg(l) + Br2(l) from the following information.
    13·2 answers
  • If you have exactly 2.00 moles each, of two different substances, then which of the following must be true about the two samples
    10·1 answer
  • As you move across the period on the periodic table what pattern can be described about the electron configurations?
    5·1 answer
  • James mixed Barium and oxide. what does he get? how does it work?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!