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
djyliett [7]
3 years ago
9

A monoprotic weak acid, HA , dissociates in water according to the reaction HA ( aq ) − ⇀ ↽ − H + ( aq ) + A − ( aq ) The equili

brium concentrations of the reactants and products are [ HA ] = 0.170 M , [ H + ] = 2.00 × 10 − 4 M , and [ A − ] = 2.00 × 10 − 4 M . Calculate the value of p K a for the acid HA .

Chemistry
1 answer:
lana [24]3 years ago
6 0

Answer: 6.63

Explanation:Please see attachment for explanation

You might be interested in
The complete combustion of propane (C3H8) in the presence of oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g) 3CO2 (g) + 4H2O (g) a
mixas84 [53]

Answer:

26.9 L is the volume of CO₂, we obtained

Explanation:

The reaction is: C₃H₈(g) + 5O₂(g)  →  3CO₂ (g) + 4H₂O (g)

Let's determine the reactants moles:

27.5 g . 1mol / 44 g = 0.625 moles

We need density of O₂ to determine mass and then, the moles.

O₂ density = O₂ mass / O₂ volume

O₂ density . O₂ volume = O₂ mass

1.429 g/L . 45L = O₂ mass → 64.3 g

Moles of O₂ → 64.3 g . 1mol/32g = 2.009 moles

Let's find out the limiting reactant:

1 mol of propane needs 5 moles of oxygen to react

Then, 0.625 moles will react with (0.625 . 5)/1 = 3.125 moles of O₂

Oxygen is the limiting reactant, we need 3.125 moles but we only have 2.009 moles

Ratio is 5:3. 5 moles of O₂ produce 3 moles of CO₂

Therefore, 2.009 moles of O₂ must produce (2.009 .3) /5 = 1.21 moles of CO₂. Let's find out the volume, by Ideal Gases Law (STP are 1 atm and 273K, the standard conditions)

1 atm . V = 1.21 moles . 0.082 . 273K

V = (1.21 moles . 0.082 . 273K) / 1atm = 26.9 L

3 0
3 years ago
PLEASE HELP! Class is almost ending, I don't want to repeat.
nikklg [1K]
ANSWERS:

1. 2KClO_{3} ⇒ 2KCl + 3O_{2}

2. H_{2}  C_{2} O_{4}  + 2NaOH ⇒ Na_{2}  C_{2} O_{4}  + 2 H_{2} O

3. 2 C_{10}  H_{22} +  31O_{2} ⇒ 20C O_{2} + 22 H_{2} O

4. 4 H_{2} + Fe_{3} O_{4} ⇒ 3Fe +4 H_{2} O

5. 4P + 5 O_{2} ⇒ 2 P_{2}  O_{5}


I have attached my work for 1-3. I would like to see if you can get 4 and 5 on your own. but, if you are struggling/copnfused please let me know in the comments! :)

6 0
3 years ago
When reading any volume in the laboratory, we always read where the bottom of the water curve falls. This is called the______?
zavuch27 [327]

Answer: Meniscus

Explanation: There is a condition on reading volumes. For concave meniscus read volume in the lower part and for convex meniscus read volume at the upper part.

7 0
2 years ago
Read 2 more answers
How do you draw a branched carbon chain for trimethylbutane?
juin [17]

Answer:

I think this is how you draw it, but I'm not entirely sure.

Explanation:

Screenshot below:

3 0
3 years ago
Why Al is a member of group 13 rather than group 3?
Levart [38]

Answer:

Boron and Aluminium

Explanation:

Boron and Aluminium are present in Group 13 of the modern periodic table. Group 13 (IUPAC System) can also be referred to as Group III-A. Logically, Boron and Aluminum can't be placed alongwith elements such as Yttrium as they don't exhibit properties of a transition metal.

8 0
3 years ago
Other questions:
  • When scientists look at these examples, what do they know about the atoms? Carbon-12 Carbon-14
    7·1 answer
  • What is the difference between alectronegativity and ioniztion energy
    8·1 answer
  • The density of benzene at 15 ∘c is 0.8787 g/ml. calculate the mass of 0.1000 l of benzene at this temperature.
    12·2 answers
  • You’re probably familiar with the sour taste of acidic lemon juice and the slippery feel of alkaline (basic) soap. In fact, thes
    15·1 answer
  • Mg​ +2​+ 2e- → Mg oxidation or reduction
    14·1 answer
  • 2HCl+Ca(OH)2⟶CaCl2+2H2O
    14·1 answer
  • Is backbonding is possible in BF4- ? If no then why?
    8·1 answer
  • What causes earthquakes? Be sure to use the words: Core Mantle Conduction Convection Density
    7·1 answer
  • The temperature of a sample of water increases from 20°C to 46.6°C as it absorbs 23,639.6 J of heat. What is the mass of the sam
    11·1 answer
  • Under which conditions of temperature and pressure, the real gas behave ideally?​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!