Question

Estimating the Acld Content of a Son Drink Pre-Lab Exereise F The two figures at the right show the liquid level in a hurette at the start and finish of a titration, The scale is graduated in 0.1-mL increments. Fislsh Start 30 What was the net total volume of liquid dispensed? 30.3 27.7 mL What was the net volume in liters? 0277 If the burette contained 0.12 M NaOH, how many moles of NaOH were collected? Pre-Lab Exercise G An aqueous solution of citric acid needed 0.36 moles of NaOH for complete neutralization. How many moles of citric acid were in the solution? Pre-Lab Exercise H A sample of a soft drink was titrated and needed 0.12 moles of NaOH for complete neutralization. How many grams of citric acid were contained in the beverage sample?

Please help, I'm struggling with this. All of it. Unsure if exercise F is correct..

Answer 1

F.

Volume dispersed = Final reading - initial reading = 30.3 - 2.6 = 27.7 mL

Net volumein liters = Volume in Ml / 1000 = 0.0277 Liters

Moles of NaOH = molarity * Volume in liters = 0.12 * 277 * 10^-2 = 0.332 moles

G. Citric acid has 3 acidic protons. therefore 1 mol of citric acid reacts with 3 moles of NaOH

Moles of citric acid = moles of NaOH / 3 = 0.36 / 3 = 0.12 moles

H. Moles of citric acid = 0.12 / 3 = 0.04 moles

Mass = moles * molar mass = 0.04 * 192.14 = 7.686 g