2. Use a literature source to find typical vitamin C values for the food that you analyzed. Compare these values with what you obtained. 3. Why should the instrument be zeroed using the phosphate-citrate buffer as opposed to using a solution containing DCPIP? If a fruit or vegetable sample contained a molecule that absorbed light close to the λmax for DCPIP, why is it important to perform an analysis of the sample without DCPIP present?

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic