what is Molar concentration of Acetic acid? Pour 20 mL of the 2.4 g/L acetic aci
ID: 706099 • Letter: W
Question
what is Molar concentration of Acetic acid?
Pour 20 mL of the 2.4 g/L acetic acid solution into a clean 30-mL polyethylene beaker. Measure and record the pH Then transfer the solution to a tared (or weighed) 125-mL Erienmeyer flask. Ada more 24 g/L acetic acid and, using a polyethylene transfer pipet adjust the mass of solution in the flask to 30.0+ 0.1 g. Record the mass of the sample. Add 5 drops of0.1% thymol blue indicator. Titrate the sample of acid to the first appearance of 3. se a permanent blue color. Record the final volume reading of the buret. Repeat the pH measurement and titration with a second 30.0-g sample of 2.4 g/L acetic acid. For each sample, calculate the mmol of acid/mL sample. (Assume that each 1.00g of sample 1.00 mL.) Average the values for the two samples. If they do not agree within 5%, titrate a third sample and average all three samples. Also average the pH values mea- sured for each sample before they were titrated. Calculations: Calculate the molar concentration of the 2.4 g/L acetic acid (mmol acid/ mL of acid) from the average volume of NaOH required to titrate the samples of acetic acid. Calculate the molar mass of acetic acid (g/mol) using Equation (5). Compare with the expected molar mass for acetic acid whose molecular formula is CH,COOH. Using the average molar concentration and average calculate the ionization constant for acetic acid. Compare this value with the literature value and with the value measured by the half-neutralization method.Explanation / Answer
Molar comcconcentra of acitic acid = 2.4/60
=> .0.04 M
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