NaOH → Na+ + OH‒
**Na+ → neutral ion
Reaction: CH3COOH + OH‒ ⇌ CH3COO‒ + H2O
Step 1: Calculate the volume (mL) of 0.0372 M NaOH needed to reach the point(s)
molarity (volume) → moles
*convert volumes from mL to L → 1 mL = 10-3 L
at the equivalence point of a titration:
VNaOH = 58.99 mL
Step 2. Calculate the initial amounts of acid and base in moles before the reaction happens.
moles CH3COOH = 2.1944×10‒3 mol
moles CH3COOH = moles NaOH
moles NaOH = 2.1944×10‒3 mol
Step 3. Construct an ICF Chart.
After the reaction is complete the solution contains:
▪ 2.1944×10‒3 mol CH3COO‒ → conjugate base
Step 4. Calculate the new concentration of the species left in the solution.
volume of solution = 0.10119 L
molarity CH3COO‒ = 0.0217 M
Step 5. Calculate pH.
• Since only the conjugate base is present after the titration and the conjugate base is a weak base, we will use an ICE chart to find pH.
We will need the Kb for the reaction.
Ka CH3COOH = 1.8×10‒5
Ka and Kb are connected by the following equation:
Where Kw is the autoionization constant of water:
Assuming the reaction is at 25°C: Kw = 1.0x10-14
Kb = 5.556x10‒10
Kb is also an equilibrium expression and can be calculated as:
Solids and liquids are ignored in equilibrium expressions
Find the pH of the equivalence point(s) and the volume (mL) of 0.0372 M NaOH needed to reach the point(s) in titrations of
(a) 42.2 mL of 0.0520 M CH 3COOH
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Weak Acid Strong Base Titrations concept. You can view video lessons to learn Weak Acid Strong Base Titrations. Or if you need more Weak Acid Strong Base Titrations practice, you can also practice Weak Acid Strong Base Titrations practice problems.
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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.