DIFFUSION AND OSMOSIS - LAB REPORT SHEET

Your supervisor asks to make 300 mL of a 1.0% (w/v) starch solution using a 5% (w/v) stock solution. You have calcuated how much stock solution you need. But, how much water (in mL) will you need to add to the stock to achieve the correct final concentration?

1. Would you say that indicator tests are qualitative or quantitative? Explain your answer. 2. a. How does the Benedict test detect monosaccharides? (be specific!) b. Why can't the Benedict's test easily detect the sugar units of a starch? How does the Iodine test detect starch? (be specific!) b. Why can't the sugar units of a monosaccharide solution be detected with Iodine? (hint: "because it's not designed to" is not the answer I'm looking for!) 3. а. 4. a. What was different about the two protein solutions? b. How does the Biuret indicator detect proteins (and thus only one of the protein solutions)?

QUESTION 5 consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane. Which of the following occurs in this system?     A. There is a net flow of water from the 4% starch solution into the 10% starch solution.     B. There is a net flow of water from the 10% starch solution into the 4% starch solution.     C. Water does not cross the membrane at all.     D. Water flows equally in both directions.     E. Starch moves out of the 10% starch solution into the 4% starch solution.

Part O A semipermeable membrane separates a 4% starch solution and a 2% starch solution.   Initially water will flow from the 2% starch solution to the 4% starch solution. The water level of the 2% starch solution will rise. The 2% starch solution will be diluted. All of these are true.

consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane. Which of the following occurs in this system?     A. There is a net flow of water from the 4% starch solution into the 10% starch solution.     B. There is a net flow of water from the 10% starch solution into the 4% starch solution.     C. Water does not cross the membrane at all.     D. Water flows equally in both directions.     E. Starch moves out of the 10% starch solution into the 4% starch solution

PROCEDURES 1. Search at least five food products at home. 2. Determine the major fat component (Saturated or Unsaturated) RESULTS FOOD PRODUCTS French Fries fried using vegetable oil French Fries fried using Types of Fats Unsaturated Advantages/Disadvantages It has health benefits/It is costlier Saturated It is much cheaper/ Not healthy – fats will be deposited in veins derived from animal oil -- CONCLUSIONS

Stock Solution : 5.5% m/v Dilute To : 4.8 % New Volume : 80mL FIND THE : Assigned concentration for the desired solution Amount of ascorbic acid stock solution used (mL) Amount of distilled water mixed with the stock solution(mL)

True or false. 1. In an immunoassay for drugs of abuse, any concentration greater than 0 is considered positive screen. 2. Traditionaly, drug screens are performed on blood samples because drug concentration in blood are much higher then in urine?

Concentration of Reagents (NH4)2S2O8 KI Na2S2O3 0.25 M 0.22 M 0.19 M Volumes of Solutions S₂082 (mL) Starch soln (mL) KNO3 (mL) EDTA soln (mL) KI (mL) S₂O32- (mL) x 5 9.7 0.9 26.4 0.5 9.9 1.1 Using the above data determine the concentration of I at the moment the reaction begins. HINT: This is a mixing problem. Determine the total number of moles of I and divide this amount by the total volume (in L). Be careful... If you go back and try this exercise again the values will change. Read the question carefully! Answer:

How many liters each of 0.5% (w/v) saline solution and 2% (w/v) saline to produce 10 L of normal saline? Remember, normal saline is 0.9% (w/v) saline.

( asap in detail plz )

From the tabulated data, deduce which fat/oil sample could be best described as saturated, monounsaturated and poly-unsaturated.

The usual concentration of the agarose gel used is 1% (w/v) agarose. If you were to make 50 ml of the agarose gel solution, how much powdered agarose would you need in grams?

Hello good day, I am having a problem answering this question and I need your help on this. Hoping for a response and thank you. Question: Briefly explain the difference in solubility of coconut oil in water and chloroform.

A glucosamine solution of unknown concentration was diluted as follows:  1 mL of the solution was diluted to 5.0  mL.  A 0.3 mL aliquot of this solution was diluted with 0.7 mL of water. The concentration of the final diluted solution is 0.292 umol/mL. What is the concentration of the original undiluted solution?    Original: ? First dilution: ? Final dilution: 0.292 umol/mL

Why is the glucose assay one of the most common analytical test performed in clinical chemistry.

What is the analysis and conclusion? in the picture.

An erythrocyte placed in pure water will lyse, but bacteria usually won’t. This is because        A. Bacteria grow best in pure water B. The cell wall prevents bacterial lysis C. Most bacteria will simply produce spores in that situation D. Bacteria cane move quickly

27. Convert a 120.0 mg/dL BUN value to mmol/L urea. The molecular weight of urea = 60.07 60.07. 28. Convert a 34.0 mg/dL BUN value to mmol/L urea. The molecular weight of urea = Cannast the falls

Express answer with two decimal places. The amount of albumin in a blood sample was determined to be 82 mg %. This is equivalent to _________ mg/dL.

ipboard Font Paragraph Styles Aspirin Yield Lab NAME: 6. How much aspirin is needed for Part B #1? PRE-LAB 1. What is an antipyretic? REPORT: 2. What is an analgesic? A. Preparation of Aspirin DAY 1 3. What is the "active ingredient" in aspirin? Why is it not ingested directly? 1. Mass of salicylic acid (g) 2. Mass of filter paper (g) 4. In this experiment, 2.00 g of salicylic acid reacts with an excess amount of acetic anhydride. Calculate the theoretical yield of acetylsalicylic acid for this synthesis. 3. Mass of dried filter paper plus sample (g) 4. Theoretical yield of aspirin (g) 5. Experimental (actual) yield of aspirin (g) 5. A0.331 g sample of aspirin prepared in the laboratory was dissolved in 95% ethanol and titrated to a phenolphthalein endpoint with 16.7 ml of 0.107 M NAOH. 7. Volume of water used in the experiment 8. Mass of aspirin dissolved in the experiment (see A7 a. Calculate the moles of acetylsalicylic acid in the aspirin sample. 6. Experimental yield, corrected…

A H-bond has a delta u of around 1 kcal/mol. Answer both part a and part b please.   Part a) What fraction of the hydrogen bonds would be broken at 27 celsius (room temperature) and how many hydrogen bonds would be broken at 100 celsius? Part b) Using your answer from Part a, explain why proteins are stored on ice?

do both please

Chapter 8 lab detecting diffusion

I need help please with question 1

why is it necessary to use decarbonated cola?

Please answer the PHYSICAL DESCRIPTION table and add short captions for the photos. THANK YOU.

Explain why concentration of sucrose should not be too high or too low in syrups?

You are given a protein solution with a concentration of 0.15 mg/ml. Suppose that we want to prepare 1 ml of 10 μg/ml solution. How much of H2O and protein stock do we need to add to obtain the target concentration and volume?