What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

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Question: What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

Options:

10.3
11.0
11.5
12.0

Correct Answer: 11.0

Solution:

Na2CO3 is a salt of a weak acid (H2CO3) and a strong base (NaOH). The pH can be estimated using the hydrolysis of CO3^2- which gives a pH around 11.0.

What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

Practice Questions

What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

10.3
11.0
11.5
12.0

Questions & Step-by-Step Solutions

What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

Step 1: Identify the compound. Na2CO3 is sodium carbonate, which is a salt formed from a weak acid (carbonic acid, H2CO3) and a strong base (sodium hydroxide, NaOH).
Step 2: Understand that when Na2CO3 dissolves in water, it dissociates into Na+ ions and CO3^2- ions.
Step 3: Recognize that CO3^2- (carbonate ion) can react with water in a process called hydrolysis, which can affect the pH of the solution.
Step 4: Write the hydrolysis reaction: CO3^2- + H2O ⇌ HCO3^- + OH-. This reaction produces hydroxide ions (OH-), which increase the pH of the solution.
Step 5: Since Na2CO3 is a salt of a weak acid and a strong base, the solution will be basic. The pH can be estimated to be around 11.0.

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What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

What’s inside this PDF?

What is the pH of a solution when 0.1 M of Na2CO3 is dissolved in water? (2023)

Practice Questions

Questions & Step-by-Step Solutions

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