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
11111nata11111 [884]
3 years ago
5

Select the statements that describe a method which can be used to make a buffer. (A) Partially neutralize a strong acid solution

by addition of a strong base.(B) Add appropriate quantities of weak acid and its conjugate base to water.(C) Partially neutralize a weak acid solution by addition of a strong base.(D) Partially neutralize a weak base solution by addition of a strong acid.(E) Partially neutralize a strong base solution by addition of a strong acid.
Chemistry
2 answers:
Marina86 [1]3 years ago
4 0

Answer:

(B) Add appropriate quantities of weak acid and its conjugate base to water.

(C) Partially neutralize a weak acid solution by addition of a strong base.

(D) Partially neutralize a weak base solution by addition of a strong acid.

Explanation:

A buffer is an aquos solution in which you mix a weak base and a weak acid in order to create a solution that would react as neutralizer when strong acids or bases are added to it, the buffers are used to keep the ph of substances stable by adding a buffer to those substances. The only way to create a buffer is by mixing weak bases with its conjugate weak acids in water, or the other way around. So the only one from the options that would be correct would be (B) Add appropriate quantities of weak acid and its conjugate base to water.

Hunter-Best [27]3 years ago
3 0

Answer:

B) Add appropriate quantities of weak acid and its conjugate base to water.

C) Partially neutralize a weak acid solution by addition of a strong base.

(D) Partially neutralize a weak base solution by addition of a strong acid.

Explanation:

A buffer solution is made by a weak acid and its conjugated base or a weak base and its conjugated acid.

If you add a weak acid to water, you can adjust the pH of the buffer solution by adding a strong base.

If ypu add a weak base to water, you can adjust the pH of the buffer solution by adding a strong acid.

You might be interested in
galvanic cell is powered by the following redox reaction: (g) (aq) (l)(aq) (s) (aq) Answer the following questions about this ce
kotykmax [81]

Answer:

Explanation:

1. the 1/2 reaction that occurs at the cathode

3Cl2(g) +6e^- -------------> 6Cl^- (aq)

2 the 1/2 reaction that occurs at the anode

2MnO2(s) + 8OH^-(aq) ----------> 2MnO4^- (aq) + 4H2O(l) +6e^-      

2MnO2(s) + 8OH^-(aq) ----------> 2MnO4^- (aq) + 4H2O(l) +6e^-

E0 = -0.59v

3Cl2(g) +6e^- -------------> 6Cl^- (aq)                                                  

E0 = 1.39v

3Cl2 (g) + 2MnO2 (s) + 8OH^(−) (aq)---------> 6Cl^(−) (aq) + 2MnO4^(−) (aq) + 4H2O (l)  

E0cell = 0.80v

5 0
3 years ago
What two terms are used to describe the temperature at which solids and liquids of the same substance exist at the same time?
goldenfox [79]

Answer:

The answer is melting and freezing point.

Explanation:

5 0
2 years ago
How many molecules of N204 are in 85.0 g of N2O4?
alukav5142 [94]

Answer:

5.56 × 10^23 molecules

Explanation:

The number of molecules in a molecule can be calculated by multiplying the number of moles in that molecule by Avagadro's number (6.02 × 10^23)

Using mole = mass/molar mass

Molar mass of N2O4 = 14(2) + 16(4)

= 28 + 64

= 92g/mol

mole = 85.0/92

= 0.9239

= 0.924mol

number of molecules of N2O4 (nA) = 0.924 × 6.02 × 10^23

= 5.56 × 10^23 molecules

4 0
3 years ago
The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (C3H8) to
adelina 88 [10]

Answer:

At the burner temp. and pressure, 18.85 litres of air is needed to completely combust each gram of propane

Explanation:

The combustion stoichiometry is as follows:

      C₃H₈ + 5O₂  = 4 H₂O + 3CO₂      The molecular weights (g/mol) are:

MW  44    5x32      4x18    3x44

So each gram of propane is 1/44 = 0.02272 mol propane

and will need 5 x 0.02272 = 0.1136 mol oxygen

At 0.21 mol fraction oxygen in air, 0.1136 / 0.21 = 0.54 mol air is needed to burn the propane.

At the low pressure in the burner we can use the Ideal Gas Law

PV=nRT, or V = nRT/P

P = 1.1 x 101325 Pa = 111457 Pa

T = 195°C + 273 = 468 K

R = 8.314

and we calculated n = number of moles air = 0.54 mol

So V m³ = 0.54 x 8.314 x 468 / 111457 = 0.0188 m³ = 18.85 litres air.

6 0
3 years ago
When a substance changes from gas to liquid at a temperature below its boiling point, ____ has taken place.
puteri [66]
That would be evaporation.
Hope this helped!! xx
5 0
3 years ago
Other questions:
  • Consider three possible atomic arrangements for cyanamide (CH 2 N 2 ): (a)H 2 CNN (b)H 2 NCN (c)HNNCH Using formal charges as a
    8·1 answer
  • 1.72 mol of LiCl in 37.5 L of solution
    9·1 answer
  • The perspective formula of threonine, an amino acid with two asymmetric centers, is provided below. perspective formula of threo
    13·1 answer
  • A 65 kg diver jumps off a 10 m platform.
    12·1 answer
  • Which of these is caused by a chemical change?
    8·1 answer
  • In kinetics, the order of a reaction
    7·1 answer
  • Explain chromatography​
    15·1 answer
  • Determine the volume of liquid in each graduated cylinders.
    5·1 answer
  • How much aluminum nitrate can be found when 21g of aluminum react with lead (II) nitrate? Answer in units of mol.
    7·1 answer
  • Compare both images located above. Which of the two is an elastic collision and
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!