Describe the procedure you would follow to determine the concentration of vitamin c in a sample if the volume of dcpip required to reach the end point were more than the 10-mL graduated cylinder could hold. The titration must still be carried out in the 10-mL graduated cylinder. Be sure to include any calculations that you would need to perform.
->I searched this problem up, but I wasn't satisfied with the answers because I didn't understand why (one of the answers talks about using an aliquot, but I don't know how an aliquot would be used in this type of problem)
-> This is from a lab called: "Vitamin c in fruit juices by redox titration"
4 answers
And you haven't come close to providing enough information for us to know what the problem is.
Sorry... I don't know what information to provide you... I thought the problem was just asking "what must one need to do in order to carry out the titration although the endpoint reaches a volume more than the 10-mL graduated cylinder can hold." I have data with me that I collected through my experiment, and I made an equation with it which is y=2.38x+0.1
->I really don't understand this problem... please if you do have any info or ways to solve it I would be glad with it. The biggest hurdle for me on this question is how would one carry out the experiment knowing that the endpoint would not be reached without having the graduated cylinder overflow.
->I really don't understand this problem... please if you do have any info or ways to solve it I would be glad with it. The biggest hurdle for me on this question is how would one carry out the experiment knowing that the endpoint would not be reached without having the graduated cylinder overflow.
One thing you could have done is to provide the possible answers. An aliquot is the way to go.
Without knowing the details I can only generalize. What you want to do is to take an aliquot of the sample. Apparently you are titrating into a 10 mL graduated cylinder, or at least a container with that volume. So using a smaller volume will require less titrant to be used. What is the volume you are titrating? Something like 5 mL. Then take 1 mL and titrate that. Whatever volume is used to titrate the 1 mL sample is multiplied by 5 to know what the full sample would have required and you go from there.
Without knowing the details I can only generalize. What you want to do is to take an aliquot of the sample. Apparently you are titrating into a 10 mL graduated cylinder, or at least a container with that volume. So using a smaller volume will require less titrant to be used. What is the volume you are titrating? Something like 5 mL. Then take 1 mL and titrate that. Whatever volume is used to titrate the 1 mL sample is multiplied by 5 to know what the full sample would have required and you go from there.
DrBob222 thank you so much! you don't know how much I was struggling. The information is enough for me :)
1 answer