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
givi [52]
3 years ago
6

For a particular redox reaction, Cr is oxidized to CrO 2 − 4 and Ag + is reduced to Ag . Complete and balance the equation for t

his reaction in basic solution. The phases are optional. balanced reaction: Cr + Ag^{+} -> CrO_{4}^{2}^{-} + Ag Cr + Ag + ⟶ CrO 2 − 4 + Ag
Chemistry
1 answer:
Sunny_sXe [5.5K]3 years ago
7 0

Answer:

6Ag⁺ + Cr + 8OH⁻ → 6Ag + CrO₄²⁻ + 4H₂O

Explanation:

We can balance the redox reaction of Cr and Ag⁺, in terms of two half-reactions, one for Ag⁺ and other for Cr:

Ag⁺   →   Ag      

In the above equation we need to balance the number of electrons, we know that the Ag⁺ is being reduced to Ag, so the reaction is:

Ag⁺ + e⁻ →  Ag   (1)

Now, we need to balance the half-reaction of Cr:

Cr   →  CrO₄²⁻  

From above, we know that the Cr is being oxidated to CrO₄²⁻, so we need to balance the number of electrons and the number of oxygen atoms. The Cr⁰ is being oxidated to Cr⁶⁺, so for the electron balance, we need to add 6e⁻ to the right side of the equation. Since the reaction is in a basic medium, the oxygen atoms will be balanced with OH⁻ ions as follows:          

Cr + OH⁻ →  CrO₄²⁻ + 6e⁻  

The hydrogen atoms will be balanced using H₂O molecules:  

Cr + OH⁻ →  CrO₄²⁻ + 6e⁻ + H₂O    

The balanced equation is:

Cr + 8OH⁻ →  CrO₄²⁻ + 6e⁻ + 4H₂O   (2)

Since the reaction (1) involves 1 electron and the reaction (2) involves 6 electrons, by increasing the reaction (1) six times and by the addition of the two reactions (1 and 2) we can have the net redox reaction:

6*(Ag⁺ + e⁻ →  Ag)  

<u>Cr + 8OH⁻ →  CrO₄²⁻ + 6e⁻ + 4H₂O</u>

6Ag⁺ + Cr + 8OH⁻ → 6Ag + CrO₄²⁻ + 4H₂O                  

Therefore, the net equation is: 6Ag⁺ + Cr + 8OH⁻ → 6Ag + CrO₄²⁻ + 4H₂O.

I hope it helps you!

You might be interested in
Calculate freeze 62.9 g of iron at 1535oC<br> Hf (J/g)=257
Inessa [10]

Answer:

<u>-16200J</u>

Explanation:

(257J/g)(62.9g)

eliminate the variables

u get 16165.3

go to 3 significant digits

u get 16200

and since it is freezing we are taking out energy so it would be

-16200J

4 0
3 years ago
Which equation shows how to calculate how many grams (g) of KOH would be needed to fully react with 4 mol Mg(OH)2? The balanced
bazaltina [42]
Mole ratio:

MgCl₂ + 2 KOH = Mg(OH)₂ + 2 KCl

2 moles KOH ---------------- 1 mole Mg(OH)₂
moles KOH ------------------- 4 moles Mg(OH₂)

moles KOH = 4 x 2 / 1

= 8 moles of  KOH

molar mass KOH = 56 g/mol

mass of KOH = n x mm

mass of  KOH = 8 x 56

= 448 g of KOH 

hope this helps!

3 0
3 years ago
Read 2 more answers
In fractional distillation, liquid can be seen running from the bottom of the distillation column back into the distilling flask
shepuryov [24]

Answer:

substances with a higher boiling point are returning back to the flask which allows another substances with the specific context temperature (lower boiling point) to boil over and be purified.

Explanation:

The reason it happens because the lower boiling point substance vaporizes and crosses over while the other substance is waiting for its boiling point to reach

7 0
3 years ago
What will lithium and bromine make when they bond
Rus_ich [418]

Answer:

they will form a compound

5 0
3 years ago
Read 2 more answers
1) Compared to other main group hydrides, such as CH4, NH3, H2S and HF, water is unique because it is a liquid at room temperatu
ddd [48]
1. d. Water is able to dissolve non-polar gases like oxygen and carbon dioxide.

2. d. -4.8 degree Celsius

3. a. Each solution has the same number of relative particles of solute per kilogram of solvent. 
8 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following does nitrogen have an oxidation state of +4?
    13·1 answer
  • A technique that uses a porous barrier to separate heterogeneous mixtures is ?
    11·1 answer
  • Periodic Table High School Reference Sheet
    8·1 answer
  • NEED URGENT HELP WITH SCIENCE HOMEWORK. TRIED MY BEST TO FIGURE OUT BUT COULDNT. I WILL MARK YOU BRAINLIEST!!
    8·1 answer
  • Identify the missing coefficient in the balanced equation and classify the type of reaction. Al2(CO3)3 ⟶ Al2O3 + ___CO2
    5·2 answers
  • How many atoms are in 3.47 moles of C2H2? Please show work.
    11·1 answer
  • What one is correct?
    6·1 answer
  • What is quantum physics​
    7·1 answer
  • A ________________________ can be at the top of a food chain.
    8·1 answer
  • When carbon dioxide dissolves in water, it undergoes a multistep equilibrium process, with Koverall = 4.5x10⁻⁷, which is simplif
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!