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
n200080 [17]
3 years ago
8

Bromocresol green, Ka=2.0×10−5, is yellow in its protonated form (HX) and blue in its ionized form (X−). At what pH will bromocr

esol green be a perfect green color?
Chemistry
1 answer:
nydimaria [60]3 years ago
4 0

Answer:

pH = 4,70

Explanation:

For bromocresol, as HX is yellow and X⁻ is blue, the indicator will be a perfect green color when HX = X⁻.

Using Henderson-Hasselbalch formula:

pH = pka + log [X⁻]/[HX] <em>(1)</em>

Where pka is -log ka = -log2,0x10⁻⁵ = 4,70

As HX = X⁻, [HX] / [X⁻] = 1

Replacing in (1):

pH = 4,70 + log 1

pH = 4,70 + 0

<em>pH = 4,70</em>

<em></em>

I hope it helps!

You might be interested in
Please help!
Grace [21]
The most common reaction that causes spoilage isn't a reaction at all. Molds and Bacteria are attracted to the easily found presence of water in the fruit. They find a natural place to reproduce and what they do causes spoilage.

Very few sources talk about the chemical changes that take place. If you put fruit in a refrigerator it slows the spoiling process down. That means that the chemical reaction has to be endothermic (it requires heat to occur)

The process of spoilage is speeded up by bananas for example, giving up Ethylene gas. You do not want to put a banana with tomatoes, because tomatoes are very sensitive to Ethylene. (It's OK to eat them together. They make a terrific salad. Yum).

I cannot find a definitive source that connects all this together, but the conduct of the fruit in refrigerators confirms what I am saying.

Spoilage is a very complex reaction and interaction with the environment. I have given you a hint of what happens but you should search it out to convince yourself of the outcome.
3 0
3 years ago
What is the function of a mordant in gram staining?
Anna71 [15]
The  function  of  mordant  in  the   gram  staining  is  to   expose  grams  positive  cell  to  the  decolorizer  which  dissolves  the  lipids  in  the  cell  wall   thus  allowing  the  crystals  violent-iodine  to  leach  out  of  the  cell. This  facilitate  the  cell  subsequently   be  stained  by  with  safranin.
5 0
2 years ago
Read 2 more answers
The following are formed as white precipitates in solution except
aniked [119]

Answer:

A. Iron (III) hydroxide

Explanation:

Orange-brown or rust

6 0
2 years ago
Read 2 more answers
1gallon=3.79 liters, The gas tank of a car holds 15 gallons.if you were traveling in Europe how many liters if petrol would you
Andrei [34K]
For an approximate result, multiply the volume value by 3.785
Answer ≈ 56.7812
6 0
3 years ago
Read 2 more answers
What is the percent of copper in CuS?
bonufazy [111]

Answer:

Element Symbol Mass Percent

Cuprum Cu 66.464%

Sulfur S 33.537%

Explanation:

I got this out of my module, sorry if it's wrong but i am pretty sure 97% this is correct!

7 0
2 years ago
Other questions:
  • QUE NOMBRE RECIBE LA MASA GASEOSA QUE ENVUELVE LA TIERRA
    9·1 answer
  • The standard enthalpy of certain reaction is approximately constant at +125kJmol-1 from 800K to 1500K. The standard Gibbs energy
    14·1 answer
  • PLEASANSWERSOONThe elements on the Periodic Table that we use today are arranged by
    7·1 answer
  • How can chloroform dissolve in water? Include information about molecular shape and polarity.
    8·1 answer
  • Y
    15·1 answer
  • What is the percent enantiomeric excess (ee) of a mixture that has 86% of one enantiomer and 14% of the other
    11·1 answer
  • In at least 4 complete sentences, describe the similarities and differences between Avogadro's Law and Charles' Law.
    14·1 answer
  • 1. What do microorganisms share in common?​
    10·1 answer
  • What is ionisation enthalpy?<br>_<br>brúh +_-​
    13·1 answer
  • PLS HURRRRRRRRYYYY!!!!
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!