mL of 0.0100 M NaOH are added to 25.0 mL of 0.0100 M acetic acid. What is the pH of the resulting solution?
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5 mL of 0.0100 M NaOH are added to 25.0 mL of 0.0100 M acetic acid. What is the pH of the resulting solution?
5 mL x 0.0100M = 0.0500 millimoles NaOH.
25.0 mL x 0.01M HAc = 0.250 mmoles HAc.
.............NaOH + HAc ==> NaAc + H2O
initial...0.0500..0.25.....0......0
change...-0.0500..-0.0500.0.0500.0.0500
equil......0.......0.20....0.05..0.05
Substitute the equilibrium conditions into the Henderson-Hasselbalch equation and solve for pH.
To determine the pH of the resulting solution after adding NaOH to acetic acid, you need to understand the concept of acid-base reactions and the calculation of pH.
Step 1: Write the balanced chemical equation for the reaction between acetic acid (CH3COOH) and sodium hydroxide (NaOH):
CH3COOH + NaOH → CH3COONa + H2O
Step 2: Determine the moles of acetic acid and NaOH used.
Moles of acetic acid = concentration (C) × volume (V) = 0.0100 M × 25.0 mL = 0.00025 moles
Moles of NaOH = C × V = 0.0100 M × (volume NaOH added in mL / 1000) = 0.0100 M × (volume NaOH added in mL / 1000)
Step 3: Determine the limiting reactant (the reactant that is completely consumed). In this case, acetic acid and NaOH react in a 1:1 ratio, so the limiting reactant is the one with fewer moles. Compare the moles of acetic acid and NaOH to find the limiting reactant.
Step 4: Calculate the moles of excess reactant (the reactant remaining after the limiting reactant is consumed). The excess reactant is the one with more moles. Subtract the moles of the limiting reactant from the moles of the excess reactant.
Step 5: Determine the concentration of the excess reactant after the reaction. You can use the moles of the excess reactant and the final volume of the solution.
Step 6: Determine the concentration of the resulting solution. Since the acetic acid and NaOH react in a 1:1 ratio, the concentration of the resulting solution is the same as the concentration of the excess reactant.
Step 7: Calculate the pOH of the resulting solution. Use the concentration of hydroxide ions (OH-) to calculate pOH using the formula pOH = -log[OH-].
Step 8: Calculate the pH of the resulting solution. Use the formula pH + pOH = 14 to calculate the pH.
By following these steps, you can calculate the pH of the resulting solution. Let me know if you need help with any specific calculations or if you have any further questions.