June 17, 2024, 11:22:41 PM
Forum Rules: Read This Before Posting


Topic: Acids and Bases Equlibrium/Ionic Equations  (Read 1698 times)

0 Members and 1 Guest are viewing this topic.

Offline Ipassedthisclass

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
Acids and Bases Equlibrium/Ionic Equations
« on: May 23, 2023, 12:06:56 AM »
1. The shell of a crustacean is primarily made of Calcium carbonate. As ocean acidification becomes more of a problem in our climate, crustaceans are suffering from habitat destruction.
H2O (l) + HCO3- ←→ H3O+ (aq) + CO32- (aq)           Ka = 4.7 x 10-11
You take a 1.0-Liter sample of ocean water and determine that there are 8.127 x 1017 molecules of HCO3-.  What will be the pH of the ocean based on this sample?

2. Sodium Nitrate mixes with potassium carbonate in a solution of water. Write out the ionic equation.

3. Sulfurous acid is added to water. Write out the ionic equation.

Offline Aldebaran

  • Full Member
  • ****
  • Posts: 120
  • Mole Snacks: +5/-1
Re: Acids and Bases Equlibrium/Ionic Equations
« Reply #1 on: May 23, 2023, 02:57:38 AM »
Rules of this forum require that you demonstrate your own attempts at the questions first rather than just asking someone to do your homework for you.

Offline Vidya

  • Full Member
  • ****
  • Posts: 839
  • Mole Snacks: +46/-62
  • Gender: Female
  • Online Chemistry and Organic Chemistry tutor
    • Online Chemistry Tutor
Re: Acids and Bases Equlibrium/Ionic Equations
« Reply #2 on: May 28, 2023, 10:31:54 AM »
Quote
1. The shell of a crustacean is primarily made of Calcium carbonate. As ocean acidification becomes more of a problem in our climate, crustaceans are suffering from habitat destruction.
H2O (l) + HCO3- ←→ H3O+ (aq) + CO32- (aq)           Ka = 4.7 x 10-11
You take a 1.0-Liter sample of ocean water and determine that there are 8.127 x 1017 molecules of HCO3-.  What will be the pH of the ocean based on this sample?
You need to review how to get pH of weak acids using RICE table.
Quote
. Sodium Nitrate mixes with potassium carbonate in a solution of water. Write out the ionic equation.

3. Sulfurous acid is added to water. Write out the ionic equation.
Start with strong electrolytes and weak electrolytes .

Offline Blackwhite

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
Re: Acids and Bases Equlibrium/Ionic Equations
« Reply #3 on: June 22, 2023, 02:15:50 PM »
When a strong acid and a strong base are mixed, they react according to the following net-ionic equation: H₃O⁺(aq) + OH⁻(aq) → 2H₂O(l). If either the acid or the base is in excess, the pH of the resulting solution can be determined from the concentration of excess reactant.

Offline Piers Simon

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-1
Re: Acids and Bases Equlibrium/Ionic Equations
« Reply #4 on: July 18, 2023, 09:18:08 AM »
Let x be the concentration of H3O+ (mol/L) formed when HCO3- reacts. Since H2O is present in excess, we can assume that the initial concentration of HCO3- is equal to the concentration formed:

[HCO3-] = x (mol/L)
[H3O+] = x (mol/L)

The equation for the equilibrium constant (Ka) is given as:

Ka = [H3O+][CO32-] / [HCO3-]

Given Ka = 4.7 x 10^-11 and [HCO3-] = 8.127 x 10^17 molecules in 1.0 liter (which is equivalent to 8.127 x 10^-8 mol/L):

4.7 x 10^-11 = (x)(x) / (8.127 x 10^-8)

Solving for x:

x^2 = 4.7 x 10^-11 * 8.127 x 10^-8
x^2 = 3.82969 x 10^-18
x ≈ 1.956 x 10^-9 mol/L

Now, to find the pH, we can use the equation:

pH = -log[H3O+]

pH ≈ -log(1.956 x 10^-9)
pH ≈ 8.71

So, the pH of the ocean based on this sample is approximately 8.71.

Ionic equation for the reaction of Sodium Nitrate (NaNO3) with Potassium Carbonate (K2CO3) in water:
NaNO3(aq) + K2CO3(aq) → 2KNO3(aq) + Na2CO3(aq)

Ionic equation for the addition of Sulfurous Acid (H2SO3) to water:
H2SO3(aq) → H+(aq) + HSO3-(aq)

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27702
  • Mole Snacks: +1804/-411
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Acids and Bases Equlibrium/Ionic Equations
« Reply #5 on: July 19, 2023, 02:47:36 AM »
So, the pH of the ocean based on this sample is approximately 8.71.

Please read the forum rules. You clicked "I did" while registering, but apparently you lied.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Sponsored Links