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
iren [92.7K]
3 years ago
14

What mass of sodium benzoate should be added to 150.0 ml of a 0.15 m benzoic acid solution in order to obtain a buffer with a ph

of 4.25? (assume no volume change.)?
Chemistry
1 answer:
Monica [59]3 years ago
3 0
When we know the Pka value = 4.19 

so, we are going to use H-H equation:

PH = Pka + ㏒[benzoate/benzoic acid]

when we have PH = 4.25 

and Pka = 4.19 

so by substitution:

4.25 = 4.19 + ㏒[benzaoate/ benzoic acid]

∴ [benzaoate/benzoic acid] = 1.148 M

when the [benzoic acid ] = 0.15 m 

∴ [benzaoate] = 1.148M * 0.15m 

                        = 0.1722 M

∴ moles of sodium benzoate = molarity * volume L

                                                 = 0.1722 M * 0.15 L 

                                                 = 0.02583 moles

∴ the mass = moles * molar mass

                   = 0.02583 moles* 144 g/mol

                   = 3.72 g


You might be interested in
Jenavius placed a marshmallow in the microwave to make a smore for desert. The marshmallow expanded when it was heated. How can
puteri [66]
The heat is expanding it from the inside it cooks from the inside out
8 0
3 years ago
Read 2 more answers
Which statements describe elements?
monitta

Answer: B,C,D

Explanation: Who ever reads this have a great day and stay safe :}

8 0
3 years ago
Read 2 more answers
Why are salt and sugar both able to dissolve in water, even though the solutes have different types of chemical bonding? everyth
Bas_tet [7]

Sucrose and other simple sugars may dissolve in water because they are polar molecules with an unequal charge distribution. Water is also quite polar, capable of forming weak, temporary connections with other polar compounds.

Salt dissolves into ions, with Na being positively charged and CL being negatively charged. Because water is highly polar (parts of the molecule are negatively charged while others are positively charged), the sodium ions are surrounded by water molecules, with the negatively charged component of the water molecules surrounding the NA ion. The Cl ion experiences the inverse effect.

<h3>How does salt dissolve in water compared to sugar?</h3>

A solution's solute and solvent are two different types of substances that can dissolve one another. Different solvents have different levels of solubility for different solutes. For instance, sugar is far more soluble in water than salt. Even sugar, though, has a limit on how much may dissolve.

learn more about solubility refer:

brainly.com/question/23946616

#SPJ4

5 0
1 year ago
The partial pressure of hellium gas in a gaseous mixture of hellium and hydrogen is<br>​
RUDIKE [14]

Answer:

The partial pressure of helium gas in a gaseous mixture of helium and hydrogen is the pressure that the helium would exert in the absence of the hydrogen. equal to the total pressure divided by helium's molar mass. O equal to the total pressure divided by the number of helium atoms present.

Hope this Helps (✿◡‿◡)

8 0
3 years ago
In this reaction, what is the correct coefficient for hydrogen gas? ? h2 + ? o2 ? ? h2o
iragen [17]
To balance a chemical reaction, it is important to remember that the number of atoms of each element in the reactants and the product side should be equal. This is to follows the law of conservation of mass where mass cannot be created or destroyed. So, the total mass that is used to react should have the same value of the total mass of the substances produced from the reactants. The balanced chemical reaction would be written as follows:

<span> 2h2 + o2 = 2h2o

Reactant     =    Product
H = 4           =          4 
O = 2          =           2

Therefore, the correct coefficient for the hydrogen gas would be 2.</span>
6 0
3 years ago
Other questions:
  • What are the uses of zinc
    12·2 answers
  • "how many grams of calcium are consumed when 156.8 ml of oxygen"
    14·1 answer
  • How would you build a model that is ionized? what happens if an atom is too ionized? how would you build a model that is radioac
    9·1 answer
  • Which chemical equation below is balanced correctly? Al4C3 + 12H2O yields 3CH4 + 4Al(OH)3 NaCl + CaO yields Na2O + CaCl2 3LiOH +
    7·1 answer
  • In terms of bonds, what would the molecule C₆H₁₂ be classified as?
    5·1 answer
  • Mrs. Rushing has 3 chemistry classes with 24 students in each. An experiment calls for each student to use 4 test tubes. How man
    11·2 answers
  • What is the simplest formula of a compound if a sample of the compound contains 0.221 mol X, 0.442 mol Y, and 0.884 mol Z? chemP
    9·2 answers
  • An acetate buffer solution is prepared by combining 50 ml of .20 M acetic acid and 50 ml of .20 M sodium acetate. A 5 ml sample
    12·1 answer
  • How does atomic hydrogen torch function for cutting and welding purposes​
    11·1 answer
  • Which were Lenin's actions before and during the Russian Revolution? Check all that apply.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!