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
aleksley [76]
3 years ago
7

In a 0.738 m solution, a weak acid is 12.5% dissociated. calculate ka of the acid.

Chemistry
1 answer:
luda_lava [24]3 years ago
7 0
<h3><u>Answer;</u></h3>

Ka == 1.153 × 10^-4

<h3><u>Explanation</u>;</h3>

Weak acid is HA;

Equilibrium: HA(aq) + H2O(l) <=> H3O^+(aq) + A^-(aq)

Ka = [H3O^+][A^-]/[HA]  

[H3O^+] = [A^-] = (0.0125)(0.738)

                         = 0.00923 M and [HA]

                         = 0.738 M - 0.00923 M = 0.738 M because the value 0.00923  is insignificant in this case.  

Ka = (0.00923)^2/(0.738)

     <u>= 1.153 × 10^-4</u>

You might be interested in
What is the chemical formula for iron (lll) oxide?
kirza4 [7]
Fe (III) is just Fe^+3.

Oxide is O^-2

When you write them into a chemical formula, they all need to have a neutral charge. You will need two Fe^+3 and three O^-2.

This gives you Fe2O3. 
8 0
4 years ago
A cr3+(aq) solution is electrolyzed using a current of 7.40
oee [108]
When Cr+3  + 3e-  → Cr(s)

So according to the charge formula:

charge Q = I * t 

when we have I (the current) = 7.4 a

and t (the time in seconds) = 1.85d * 24h * 60 min*60sec=  159840 sec

by substitution:

Q = 7.4 a * 159840 sec = 1182816 C

now to get the mass we have to use Faraday constant which is:

F = e NA

   = 1.602 x 10^-19 * 6.022 x 10^23

  = 96485 C mol^-1

when e is the electron charge & NA Avogadro's number for the charge in on mol 

and as we can see from the equation Cu3+ reacts with 3 electrons so,

the mass of Cr(s) = Q* (1mole-/F) * (1molCr / 3 mol e-)

                            = 1182816 * (1/96485) * (1/3)

                            = 4.1 g
3 0
4 years ago
Fractions of crude oil​
Sunny_sXe [5.5K]

Answer:

Fractions. There are several ways of classifying the useful fractions that are distilled from crude oil. One general way is by dividing into three categories: light, middle, and heavy fractions. Heavier components condense at higher temperatures and are removed at the bottom of the column.

4 0
3 years ago
Read 2 more answers
How to identify if a natural substance is mixture or compound?
yawa3891 [41]
In a mixture, we can separate the elements or compounds inside easily by using physical methods, such as filtration, evaporation, distillation etc.
However, a compund is two or more elements chemically combined together, so we cannot separate them using physical methods, only with checmicals methods such as apply heat or electricity (electrolysis)
6 0
3 years ago
What deterilnines whether or not an atom is boron
daser333 [38]

Answer:

Has 5 protons and the atomic number is 5.

Explanation:

The atomic number is equal to the number of protons and every element has a different number of protons. Therefore, finding how many protons there are and comparing to atomic numbers (or vice versa) would allow you to find if the atom is boron.

7 0
3 years ago
Other questions:
  • A scientist mines and processes a nonrenewable resource and obtains copper, which is a metal element. Which resource is the scie
    9·2 answers
  • How could you ensure that all the spectroscopes used the same calibration line and equation? What would you need to be sure was
    12·1 answer
  • Knowing the reactions between hydrogen gas and oxygen gas to form water is exothermic which would you say is greater: the averag
    5·1 answer
  • PLEASE HELP
    10·1 answer
  • Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 2.71 g of ethane is
    15·1 answer
  • Chromium(III) hydroxide has Ksp 1.6 x 10-30. What is the molar solubility of Cr(OH)3 in a solution whose pH is maintained at 6.0
    11·1 answer
  • 16.78 A buffer is prepared by mixing 525 mL of 0.50 M formic acid, HCHO2, and 475 mL of 0.50 M sodium for- mate, NaCHO2. Calcula
    11·1 answer
  • How does water’s high specific heat capacity affect large lakes?
    15·1 answer
  • What mechanical weathering process is used when water turns to ice?
    13·2 answers
  • Which is the best reason for choosing the beaker for heating the solution?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!