Calculate the molarities of CH3COOH and CH3COO-

  • Thread starter surahyot
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In summary, the conversation is about calculating the molarities of CH3COOH and CH3COO- in a buffer solution. After adding NaOH, the equilibrium of acetic acid will be altered by the reaction with OH-. To find the new concentrations, the initial concentrations of both OH- and acetic acid must be determined and used in the equilibrium equation. It is important to add the concentration of OH- to the conjugate base concentration of acetic acid.
  • #1
surahyot
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Can someone help me how to calculate the molarities of CH3COOH and CH3COO- in a buffer solution containing 40.00 ml of 0.100M acetic acid, 10.00 ml of distilled water and 30.00ml of 0.100M NaOH?
 
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  • #2
What will happen after sodium hydroxide, which dissociates completely in water, is added? The hydroxide will alter the equilibrium of the acetic acid by reacting with _______?

You need to find the new concentrations after the equilibrium.
 
Last edited:
  • #3
Still don't get it. Chemistry is a nightmare for me.Can someone explain in detail.:frown:
 
  • #4
Thus the first thing to do is to find the initial concentrations of both OH and acetic acid.

The base, OH- (which dissociates completely), will react with the acetic acid directly. So subtract the original concentration of acetic acid by the concentration of hydroxide anion. Using this concentration substitute into the equilibrium equation and find the rest of the concentrations.

Hope this answers your question.
 
  • #5
don't forget to add the concentration value of OH- to the conjugate base concentration of the acetic acid.
 
  • #6
thanks a lot
 

1. What is the formula for calculating molarity?

The formula for molarity is M = moles of solute / liters of solution.

2. How do I calculate the molarity of CH3COOH?

To calculate the molarity of CH3COOH, you need to know the number of moles of CH3COOH and the volume of the solution. Then, use the formula M = moles of CH3COOH / volume of solution in liters.

3. How do I calculate the molarity of CH3COO-?

To calculate the molarity of CH3COO-, you need to know the number of moles of CH3COO- and the volume of the solution. Then, use the formula M = moles of CH3COO- / volume of solution in liters.

4. What units are used for molarity?

Molarity is expressed in moles per liter (M).

5. Can molarity be calculated using any substance?

Yes, molarity can be calculated for any substance as long as you know the number of moles of the substance and the volume of the solution.

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