Chapter 6.3, Problem 14RQ

Determine the amount of ascorbic acid in the unknown sample using the standard concentrations and absorbance values given below.

Match the following descriptions to the tonicity adjusting method which they describe. - Cryoscopic method - White-Vincent Method - E method - Sprowl's method   It is the most widely used method in adjusting tonicity by the amount of sodium chloride.   This method expresses the freezing point in terms of 1% solution.   This method uses a constant that denotes the volume of isotonic preparation in milliliters when 1 gram of sodium chloride is dissolved in water.   This method uses a constant of 0.3 to denote the weight of the drug.   This method uses the equation "V = 33.33E".

When conducting a flame test for sodium iodide, is the result positive or negative?

How many mL of 10 x stock solution would you need to make 118 mL of 1x PBS?  Report your answer to 1 decimal place.

Write shortly about the instrumentation of ATR spectroscopy?  Answer should be to the point.

Give the color of the rice mixed with Lugol's iodine solution in these situations before exposure in a water bath:   after exposure in a water bath:   after cooling from the water bath:

Explain the color changes observed throughout the peroxide value of oil experiment. Materials:1. Old and fresh oil samples2. Distilled water3. Acetic acid/chloroform solution4. Saturated potassium iodide solution5. Sodium thiosulphate (0.01M)6. 1% Starch indicator: dissolve 1g of starch in 10 ml of water and then add 90 ml of hotwater to it

In sterilization, which among the supplies, instruments, glassware, etc. under the list of materials can be sterilized using either or both equipment below? List them down under the category: a) For “autoclaving” only, B) For Dry heat oven sterilization ,And C) Can be sterilized with either.  Materials: 200-ml Erlenmeyer flask                       Stove 500-ml Erlenmeyer flask                       Autoclave 10-mL graduated cylinder                     Analytical balance 100-ml graduated cylinder                    pH meter Spatula                                              Stirring rod 100-mL beaker                                   Test tubes Distilled water                                     Petri dish Stirring rod                                         Alcohol lamp Glass dropper

Explain this example of the following water quality serial dilution. Note the dilution factors and how you would calculate #’s from the incubated plates. ……A serial dilution yielded TNTC in the 1:1 plate and the 1:10 plate, 50 cfu’s in the 1:100 plate and 3 cfu’s in the 1:1000 plate . What is the concentration (CFU)/ml of the raw sample? Is water acceptable for potable or Recreational use? Explain. When do you use filtration rather than serial dilution