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?
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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?
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- 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.A pharmacist adds 1 pint of Alcohol USP (95% ethanol) to a 1L of a mouthwash formula. What is the new percentage of alcohol present if the original mouthwash was labelled as 12% v/v ethanol? a 30% b 38% c 45% d 35% e 40%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?
- 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?A protocol calls for 1 liter of solution that is 1.5 % (w/v) NaCl, 5mM Tris (pH 8.0), 10% (w/v) Carnation Instant Milk (we really do use this in lab!), and 0.03% (v/v) Tween-20 detergent. How do you make this solution?4. To set up your seed assay, you’ll conduct serial dilutions of a fuel derived from a renewable feedstock. To begin, you’ll make 20 mL of a 10% solution of your assigned fuel. a. How many grams of fuel will you need to make your solution? Hint: The definition of a 10% solution is 10 grams of solute (fuel in this case) in 100 mL of solution. b. You will then pour 10 mL of your 10% solution into an empty beaker. How much water (in mL) should you add to the beaker to create a 5% solution? Hint: Assume all of your fuel is completely dissolved and the volumes of the solutions are additive.
- You are given a protein solution with a concentration of 0.15 mg/ml. Suppose that we want to prepare 100 μl of 0.1 μg/μl solution. How much of H2O and protein stock do we need to add to obtain the target concentration and volume?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:1. You have a concentrated stock solution of bacterial LPS in water that has a concentration of 1 mg/ml. What is the concentration of a diluted solution with a dilution factor of 1:2? 2. Your stock solution is 1 mg/ml and your final solution is 1ug/ml. What is your dilution factor? 3. A 1 ug/ml solution is diluted so it is half as concentrated as the stock. What is the concentration of the new solution in ng/ml?
- ) In Chapter 8 (The Water Soluble Vitamins), section 8.1 (What are Vitamins) discusses Absorption, Storage and Excretion of Vitamins, both water- and fat-soluble. How readily a vitamin can be absorbed and utilized by the body is called its bioavailability. Fat-soluble vitamins require _fat__in the diet for absorption while water soluble vitamins, which include all B vitamins and vitamin ______, dissolve in water and depend on energy-requiring transport systems or need to be bound to specific molecules in the GI tract in order to be absorbed in the small intestine. Once absorbed into the blood, vitamins must be transported to the cells, mostly by being bound to _________________________ for transport. Fat soluble vitamins, which include vitamins ______, ________, _________ and _______ are incorporated into ___________________ for transport from the intestine. With the exception of vitamin B12, the water-soluble vitamins are easily excreted from the body in the urine. In contrast,…Chemistry QuestionA 1 mL sample of glycogen was calculated to contain 21 µmol (micromole) glucose. To 1 mL of this sample was added 2 mL of 2 M HCl. It was then hydrolysed by boiling the solution for 15 minutes. After boiling the hydrolysate was cooled and made up with H2O to a final volume of exactly 10 mL. The glucose was measured in this solution and found to have a concentration of 340 µg/mL (microgram/milliliter). i) Calculate the mass (mg) of glucose in the 10 mL of hydrolysate. As the 1 mL of glycogen sample was made up to a final volume of 10 mL, this mass of glucose was produced by the hydrolysis of the original 1 mL glycogen sample. ii) Calculate the amount (µmol) of glucose produced by the hydrolysis of the glycogen sample. iii) Calculate the purity of the glycogen used in the sample as % Purity = (moles of measured glucose/ moles of calculated glucose in glycogen) *100 iv) state your answer in a complete sentence. Show your working out such that the marker can easily understand it.…