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
AnnyKZ [126]
2 years ago
8

. Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:

Chemistry
1 answer:
barxatty [35]2 years ago
5 0
A. HCl:
pH= -log [H3O+]
PH=-log (0.200)
= 0.699

poH= 14-0.699
= 13.301

b. NaOH:
PoH= -log [OH-]
= -log (0.0143)
= 1.845
pH= 14-poH
= 14- 1.845
= 12.16

c. HNO3:
PH= -log[H3O+]
=-log(3.0)
= -0.4771
poH= 14-pH
= 14-9-0.4771
= 14.4771

pH= -0.4771, poH= 14.4771

d. [Ca(OH)2] = 0.0031M
[OH-]= 2X0.0031
[OH-] = 0.0062M

PoH= - log[OH-]
=-log(0.0062)
=-log(6.2x10-3)
=-(-2.21)
= 2.21
PH=14-poH
=14-2.21
=11.79
POH=2.21, PH= 11.79
You might be interested in
The standard cell potential Ec for the reduction of silver ions with elemental copper is 0.46V at 25 degrees celsius. calculate
Cloud [144]

Answer : The \Delta G for this reaction is, -88780 J/mole.

Solution :

The balanced cell reaction will be,  

Cu(s)+2Ag^+(aq)\rightarrow Cu^{2+}(aq)+2Ag(s)

Here, magnesium (Cu) undergoes oxidation by loss of electrons, thus act as anode. silver (Ag) undergoes reduction by gain of electrons and thus act as cathode.

The half oxidation-reduction reaction will be :

Oxidation : Cu\rightarrow Cu^{2+}+2e^-

Reduction : 2Ag^++2e^-\rightarrow 2Ag

Now we have to calculate the Gibbs free energy.

Formula used :

\Delta G^o=-nFE^o

where,

\Delta G^o = Gibbs free energy = ?

n = number of electrons to balance the reaction = 2

F = Faraday constant = 96500 C/mole

E^o = standard e.m.f of cell = 0.46 V

Now put all the given values in this formula, we get the Gibbs free energy.

\Delta G^o=-(2\times 96500\times 0.46)=-88780J/mole

Therefore, the \Delta G for this reaction is, -88780 J/mole.

7 0
3 years ago
A compound is 40% carbon, 6.7% hydrogen, and 53.3% oxygen. What is the empirical formula?
Ahat [919]

Answer:

                           O        H        C

Moles in 100g  3.33   6.65    3.33

Ratio                  1.00   2.00    1.00

Possible empirical formula = OH_{2}C

6 0
3 years ago
Read 2 more answers
An ice cube is placed in 80 mL of 70oC water. When the ice melts the temperature of the water is 60oC. a. How much energy was ne
tigry1 [53]

Answer:

800 degrees C g, I found this answer by using the formula to find how much energy was need to melt the ice. First you figure out the temperature change of ur ice (starting temp and ur final temp), and then you times that with the mass of the water.

8 0
3 years ago
A local barista serves coffee at 85°C. You add ice to the coffee to cool it to 55°C. Assume that an ice cube is 24 g and -18.5°C
Mama L [17]
B)4 ghhhhhhjjjyuuhhdddghhhjj’
3 0
2 years ago
1.A telescope is a tool that helps people observe distant objects. In the simplest telescope design, incoming light hits a lens
Dahasolnce [82]

Answer:

it is refraction

Explanation:

7 0
3 years ago
Other questions:
  • A compound composed of nickel and fluorine contains 9.11 g ni and 5.89 g f. what is the empirical formula of this compound
    8·1 answer
  • Red cabbage is an organic indicator for acids and bases. In the pictures above, which test tube(s) may have ammonia dissolved in
    5·2 answers
  • What’s the formula for copper (I) phosphate
    12·2 answers
  • When hcl(aq) and naoh(aq) are mixed in a beaker, the beaker feels warm to the touch. what is known about the enthalpy of this re
    6·1 answer
  • What is the molarity of a potassium triiodide solution, KI3(aq), if 30.00 mL of the solution is required to completely react wit
    12·1 answer
  • What is the link between the electronic structure of ions and the electronic structure of Noble gases
    12·1 answer
  • The beginning expansion of the big bang happened relatively slowly compared to how it is expanding now.
    5·1 answer
  • Formula for the compound Tetraoxygen nonabromide?
    11·1 answer
  • What is the molar volume (of a gas)?
    9·1 answer
  • Which statements best describe science? Check all that apply.
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!