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What is the pH of a 0.01 M solution of Na2CO3?

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Question: What is the pH of a 0.01 M solution of Na2CO3?

Options:

  1. 10
  2. 11
  3. 12
  4. 9

Correct Answer: 12

Solution: 

Na2CO3 is a basic salt, pH is approximately 11.5.

What is the pH of a 0.01 M solution of Na2CO3?

Practice Questions

Q1
What is the pH of a 0.01 M solution of Na2CO3?
  1. 10
  2. 11
  3. 12
  4. 9

Questions & Step-by-Step Solutions

What is the pH of a 0.01 M solution of Na2CO3?
  • Step 1: Identify the compound. Na2CO3 is sodium carbonate, which is a salt formed from a strong base (NaOH) and a weak acid (H2CO3).
  • Step 2: Understand that Na2CO3 will dissociate in water to form Na+ ions and CO3^2- ions.
  • Step 3: Recognize that CO3^2- can react with water to form HCO3- and OH- ions, making the solution basic.
  • Step 4: Use the concentration of the solution (0.01 M) to find the concentration of OH- ions produced from the reaction of CO3^2- with water.
  • Step 5: Calculate the pOH of the solution using the formula pOH = -log[OH-].
  • Step 6: Convert pOH to pH using the formula pH = 14 - pOH.
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