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
Daniel [21]
3 years ago
9

What is the ph of a 0.135 m aqueous solution of potassium acetate, kch3coo? (ka for ch3cooh = 1.8×10-5)?

Chemistry
1 answer:
Gennadij [26K]3 years ago
6 0
[OH-] = √(Cs×Kw)/Ka
[OH-] = √(0,135×10^-14)/1,8×10^-5
[OH-] = √0,075×10^-9 = √75×10^-12 = 8,66×10^-6

pOH = -log[OH-]
pOH = -log[8,66×10^-6]
pOH ≈ 5,0625

pH + pOH = 14
pH = 14-5,0625
pH = 8,9375

:•)
You might be interested in
A cube made of platinum (Pt) has an edge length of 1.0 cm. (a) Calculate the number of Pt atoms in the cube. (b) Atoms are spher
irina1246 [14]

Answer:

a)The total number of platinum atoms are 6.620\times 10^{22} atoms.

b)The radius of a Pt atom is 138.7 pm.

Explanation:

a) Let the total number of platinum atoms be x

And mass of x atoms of platinum be m

Edge length of platinum cube ,s= 1.0 cm

Volume of the cube = 1.0 cm^3

Density of the platinum cube = d=21.45 g/cm^3

Mass = Density × Volume

(m)=21.45 g/cm^3\times 1.0 cm^3=21.45 g

Mass of an atom of platinum = 3.240\times 10^{-22} g

x\times 3.240\times 10^{-22} g=21.45 g

x=6.620\times 10^{22} atoms

b) If only 74 percent of the space inside the cube is taken up by Pt atoms.

Volume occupied by platinum atoms = 74% of 1.0 cm^3

V'= 0.74 cm^3

Volume occupied by 6.620\times 10^{22} atoms is0.74 cm^3.

6.620\times 10^{22} \times \frac{4}{3}\pi r^3=V'

6.620\times 10^{22} \times \frac{4}{3}\times 3.14\times r^3=0.74 cm^3

r = 1.387\times 10^{-8} m = 138.7 pm

The radius of a Pt atom is 138.7 pm.

3 0
3 years ago
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of
Soloha48 [4]

N: 106Answer:

72 protons, 106 neutrons, 72 electrons.

Explanation:

to solve this use this simple method: APEMAN.

A= atomic number, P= Protons, E= Electrons.

M= Mass, A= atomic number, N= neutrons.

1. APE (atomic number, protons, electrons) are the same. since Hf (Hafnium) atomic number is 72, Hf has 72 protonsand ele ctrons.

2. to get Neutrons it will be mass-atomic number= neutrons.(M-A=N)

Hf mass= 178. So, 178-72= 106 neutrons.

4 0
3 years ago
Please help brainiest is award!!!!!!!!!!!
Alekssandra [29.7K]

Answer:

it doesnt even give you enough information for you to answer it

Explanation:

7 0
3 years ago
Read 2 more answers
HClO4 acid solution has a concentration of 5 Molarity. Calculate the concentration of this solution in
Nutka1998 [239]

Answer:

1. Percentage by weight = 0.5023 = 50.23 %

2. molar fraction =0.153

Explanation:

We know that

Molar mass of HClO4 = 100.46 g/mol

So the mass of 5 Moles= 5 x 100.46

       Mass (m)= 5 x 100.46 = 502.3 g

Lets assume that aqueous solution of HClO4  and the density of solution is equal to density of water.

Given that concentration HClO4 is 5 M it means that it have 5 moles of HClO4 in 1000 ml.

We know that

Mass = density x volume

Mass of 1000 ml  solution = 1 x 1000 =1000     ( density = 1 gm/ml)

            m'=1000 g

1.

Percentage by weight = 502.3 /1000

Percentage by weight = 0.5023 = 50.23 %

2.

We know that

molar mass of water = 18 g/mol

mass of water in 1000 ml = 1000 - 502.3 g=497.9 g

So moles of water = 497.7 /18 mole

moles of water = 27.65 moles

So molar fraction = 5/(5+27.65)

molar fraction =0.153

6 0
2 years ago
Which unit abbreviation is a measurement of force?
Artemon [7]
So,

Recall Newton's Second Law of Motion: force = mass x acceleration

Also recall:

acceleration = velocity/time
velocity = distance/time

Distance is expressed in meters.
Time is expressed in seconds.
Mass is expressed in kilograms.

v = m/s
a = m/s^2
F = m * a
F = kg * m/s^2

F= \frac{kg*m}{s^2}

The unit for force is the Newton (N).
4 0
3 years ago
Read 2 more answers
Other questions:
  • Chlorine gas was first prepared in 1774 by the oxidation of NaCl with MnO2:
    5·1 answer
  • Consider the reaction corresponding to a voltaic cell and its standard cell potential.
    7·1 answer
  • A person weighs 77.1 kg. What is his weight in pounds?
    7·2 answers
  • Which of the following is an example of an epeirogenic process?
    10·1 answer
  •  ¿Qué pasa con aquellas enfermedades para las cuales aún no hay vacunas?
    13·1 answer
  • Propanol (C3H8O), an alcohol, and methoxyethane (C3H8O), an ether, are what types of isomers?
    7·1 answer
  • Concentrated hydrochloric acid is a solution that is 37.5% mass per unit volume HCl(aq) in water. An old bottle of HCl has an un
    12·1 answer
  • The number of carbon atoms in 45.21g C
    8·1 answer
  • GUYS HELP ME PLEASE. MY TEACHER IS GONNA KILL ME IF I DONT SOLVE THIS RIGHT. Write the election configuration (H, Al, S,
    8·1 answer
  • Samples of this drawing medium have been dated back to 30,000 BCE. Group of answer choices silverpoint charcoal pencil color pen
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!