CH 3 COOH (aq) + NaHCO 3 (s) --> CH 3 COONa (aq) + CO 2 (g) + H 2 O (l) CH 3 COO

Question

CH3COOH (aq) + NaHCO3 (s) --> CH3COONa (aq) + CO2 (g) + H2O (l)

CH3COOH (aq) + NaOH (aq) --> CH3COONa (aq) + H2O(l)

For trial 1:

Volume of acetic acid solution = Mass / Density

= 5 g / 1.005 g/mL = 4.975 mL

Moles of acetic acid present = Molarity * Volume

= 0.88 mol/L * 4.975 mL / 1000 mL/L

= 0.00438

Moles of acetic acid titrated = Moles of NaOH delivered = 0.0036

Moles of NaHCO3 present in Alka-Seltzer Tablet = Moles of acetic acid present in original vinegar sample - Moles of acetic acid titrated = 0.00438 – 0.0036 = 0.00078

Moles of NaHCO3/ g Alka-Seltzer Tablet = 0.00078 / 3.22 = 0.000242

We can solve for trial 2 similarly and obtain below table

2CH3COOH (aq) + NaOH (aq) + NaHCO3 (s) --> 2 CH3COONa (aq) + 2 H2O(l) + CO2 (g)

Trail 1 Trial 2 Mass of Alka-Seltzer Tablet (g) 3.22 3.19 Moles of NaOH delivered 0.0036 0.0032 Moles of acetic acid titrated 0.0036 0.0032 Moles of acetic acid present in original vinegar sample 0.00438 0.00455 Moles of NaHCO3 present in Alka-Seltzer Tablet 0.00078 0.00135 Moles of NaHCO3/ g Alka-Seltzer Tablet 0.000242 0.000424 Average moles of NaHCO3/ g Alka-Seltzer Tablet 0.00033293

Explanation / Answer

Mailings Review View Help Design Layout Share Trial 1 Trial 2 Balanced Chemical Equation for the reaction between the active ingredient in Alka-Seltzer & acetic acid Mass of Acetic Acid Soln. (Vinegar) 5.00 5.2 Density of Acetic Adid soln. (Vinegar) 1.005 g/mL Molarity of Acetic Acid Soln. (Vinegar) (mol/L) 0.88 mol acetic acid 1L Mass of Alka-Seltzer Tablet 3.22 3.19 Balanced Chemical Equation for the reaction between the acetic acid and NaQH(aa) Initial Volume of NaQH(aq) in the Syringe (mL) 5.0 1.4 3.6 0036 0.00 0.00 0.00 0.00 0.00 5.0 1.8 3.2 0.0032 0.00 0.00 0.00 0.00 0.00 Final Volume of NaQH(aa) in Syringe (mL) Volume of NaQH(aa) Delivered (mL)* Moles of NaQH Delivered (mol)* Moles of Acetic Acid Titrated (mol)* Moles of Acetic Acid present in the original Vinegar Sample prior to either reaction (mol)* Moles of NaHCO, present in the Alka-Seltzer Tablet* Moles of NaHCO/g Alka-Seltzer* Average Moles of NaHCOs/g Alka-Seltzer mol/g Balanced Chemical Equation for the reaction

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