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
Helga [31]
3 years ago
6

pH indicator. A dye that is an acid and that appears as different colors in its protonated and deprotonated forms can be used as

a pH indicator. Suppose that you have a 0.001 M solution of a dye with a p Ka of 7.2. From the color, the concentration of the protonated form is found to be 0.0002 M. Assume that the remainder of the dye is in the deprotonated form. What is the pH of the solution? Berg, Jeremy M.. Biochemistry (p. 24). W. H. Freeman. Kindle Edition.
Chemistry
1 answer:
Vitek1552 [10]3 years ago
7 0

Answer:

pH = 7.8

Explanation:

The Henderson-Hasselbalch equation may be used to solve the problem:

pH = pKa + log([A⁻] / [HA])

The solution of concentration 0.001 M is a formal concentration, which means that it is the sum of the concentrations of the different forms of the acid. In order to find the concentration of the deprotonated form, the following equation is used:

[HA] + [A⁻] = 0.001 M

[A⁻] = 0.001 M - 0.0002 M = 0.0008 M

The values can then be substituted into the Henderson-Hasselbalch equation:

pH = 7.2 + log(0.0008M/0.0002M) = 7.8

You might be interested in
An unknown metal has a mass of 86.8 g. When 5040 J of heat are added to the sample, the sample temperature changes by 64.7 ∘ C .
grandymaker [24]

Answer: The specific heat of the unknown metal is 0.897J/g^0C

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

Q=m\times c\times \Delta T

Q = Heat absorbed=5040 Joules

m= mass of substance = 86.8 g

c = specific heat capacity = ?

Initial temperature of the water = T_i

Final temperature of the water = T_f

Change in temperature ,\Delta T=T_f-T_i=(64.7)^0C

Putting in the values, we get:

5040=86.8\times c\times 64.7^0C

c=0.897J/g^0C

The specific heat of the unknown metal is 0.897J/g^0C

4 0
3 years ago
Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Use the drop-
Inessa05 [86]

Answer:

1) mass and type of material

2) type of material

3) temperature

Explanation:

8 0
2 years ago
The main reason that it's important to test only one variable at a time is so that
bonufazy [111]

D. quantitative data can be recorded.

7 0
2 years ago
Give the conjugate acid for each compound below. co3^2-
DENIUS [597]
A conjugate acid is a conjugate base with hydrogen ions attached to it. In this case, the conjugate base is the carbonate ion, CO₃⁻². This ion can have two hydrogen ions, so the conjugate acid is:

H₂CO₃

This compound is known as carbonic acid.
7 0
3 years ago
Science thing............<br><br> Select the correct answer ♡
Alika [10]

Answer:

d

Explanation:

sugar molecules are being broken down

3 0
2 years ago
Other questions:
  • Pb(oh)2(s) → pb2+(aq) + 2oh-(aq) ksp = 1.4 x 10-20 what is the solubility of lead hydroxide in pure water? (simplify by neglecti
    5·1 answer
  • Enter an equation for the precipitation reaction that occurs (if any) when solutions of potassium hydroxide and nickel(ii) bromi
    15·2 answers
  • What discovery by Ørsted led to the development of electromagnets? A Electric currents produce magnetic fields. B Magnetic field
    14·2 answers
  • A 0.100 m solution of HCl dissolved in benzene has a freezing point depression of 0.512oC, while an 0.100 m solution of HCl in w
    14·1 answer
  • What process would farmers use to produce vegetables that will grow in a specific climate?
    5·1 answer
  • carbon has three main adjectives 12C 13c and 14c by comparing the atomic structure of the isotopes explain what is meant by the
    5·1 answer
  • How many grams of nh3 can be produced from the reaction of 28 g of n2 and 25 g of h2
    5·1 answer
  • What does one mole of H2O correspond to?
    10·2 answers
  • What evidence from the experiment shows that conduction occurred? In your answer, be sure to include the materials involved in t
    6·2 answers
  • If 725 ml of N² gas is at 1 atm, what volume will it have at 1.4 atm?​
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!