hello,
I have done a acid & base titration lab, with 0.1M vinegar (with unknown %tage acid) and 0.1 NaOH...I think the result came out ok, in avg, 25.21mL of NaOH have titrated w/ 30.0mL unknown %tage acid of vinegar.
all I am given is Density of vinegar= 1.00g/mL and Percentage composition = [(mass solute)/ (mass solution)] x100...yet I still cannot understand how to join these two questions to get a clear answer.
please help... this lab is due tomorrow and i have to go away tonight for school varsity matters..
So what's the question? If you know the density of vinegar and its percent composition, why do you need to titrate it? And you need the molarity of the NaOH for the titration to mean anything? Perhaps its 0.1 M NaOH and you just omitted the M.
yes, it is 0.1M NaOH,,, I am really stuck on this lab because I still cannot understand much of it..
Hello!
I can help you with your acid-base titration lab. To determine the percentage of acid in vinegar, you need to perform some calculations using the known information and the data from your titration.
Here are the steps to determine the percentage of acid in vinegar:
1. Calculate the number of moles of NaOH used in the titration. This can be done by multiplying the volume of NaOH used (25.21 mL) by its molarity (0.1 M). Make sure to convert mL to L.
moles of NaOH = (volume of NaOH used in L) x (molarity of NaOH)
2. Use the stoichiometry of the balanced equation between acetic acid (the acid in vinegar) and NaOH to determine the number of moles of acetic acid.
1 mole of acetic acid reacts with 1 mole of NaOH.
3. Calculate the mass of acetic acid in the volume of vinegar used in the titration. To do this, multiply the number of moles of acetic acid by its molar mass. The molar mass of acetic acid (CH3COOH) is 60.05 g/mol.
mass of acetic acid = (moles of acetic acid) x (molar mass of acetic acid)
4. Calculate the mass of the vinegar used in the titration. This can be done by multiplying the volume of vinegar used (30.0 mL) by its density (1.00 g/mL). Make sure to convert mL to L.
mass of vinegar = (volume of vinegar used in L) x (density of vinegar)
5. Finally, calculate the percentage of acid in the vinegar by using the following formula:
percentage of acid = (mass of acetic acid / mass of vinegar) x 100
Now, plug in the values you have obtained from your lab experiment and follow these steps to determine the percentage of acid in your vinegar sample.
I hope this helps! Let me know if you have any further questions.