Developmental Biology Lab Question How to make one liter of 5 M NaCl stock solution?The molar weight of NaCl is 58.44 g/mol.(Molecular weight is 58.44 Dalton or amu).
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Developmental Biology Lab Question
How to make one liter of 5 M NaCl stock solution?
The molar weight of NaCl is 58.44 g/mol.
(Molecular weight is 58.44 Dalton or amu).
Step by step
Solved in 2 steps
- MATHEMATICAL A catalog in the lab has a recipe for preparing 1 L of a TRIS buffer at 0.0500 M and with pH 8.0: dissolve 2.02 g of TRIS (free base, MW=121.1 g/mol) and 5.25 g of TRIS hydrochloride (the acidic form, MW=157.6 g/mol) in a total volume of 1 L. Verify that this recipe is correct.MATHEMATICAL Define buffering capacity. How do the following buffers differ in buffering capacity? How do they differ in pH? Buffer a: 0.01 M Na2HPO4 and 0.01 M NaH2PO4 Buffer b: 0.10 M Na2HPO4 and 0.10 M NaH2PO4 Buffer c: 1.0 M Na2HPO4 and 1.0 M NaH2PO4MATHEMATICAL The buffer needed for Question 35 can also be prepared using crystalline NaH2PO4 and a solution of 1.0 M NaOH. How would you do this?
- Plasma contains more sodium than chloride. How can this be if individual ions of sodium and chloride exactly balance each other out, and plasma is electrically neutral?MATHEMATICAL Calculate the hydrogen ion concentration, [H+], for each of the following materials: (a) Blood plasma, pH 7.4 (b) Orange juice, pH 3.5 (c) Human urine, pH 6.2 (d) Household ammonia, pH 11.5 (e) Gastric juice, pH 1.8Magnesium is an important element in the human body, especially in bones. Magnesiums atomic number is 12. Is it stable or reactive? Why? If it were to react with another atom, would it be more likely to accept or to donate one or more electrons?
- In each of the three systems, determine the state of entropy (low or high) when comparing the first and second: i. the instant that a perfume bottle is sprayed compared with 30 seconds later, ii. an old 1950s car compared with a brand new car, and iii. a living cell compared with a dead cell. a. i. low, ii. high, iii. low b. i. low, ii. high, iii. high c. i. high, ii. low, iii. high d. i. high, ii. low, iii. lowWhich of the following is most likely to be found evenly distributed in water in a homogeneous solution? sodium ions and chloride ions NaCl molecules salt crystals red blood cellsConsider a pendulum swinging. Which type(s) of energy is/are associated with the pendulum in the following instances: i. the moment at which it completes one cycle, just before it begins to fall back towards the other end, ii. the moment that it is in the middle between the two ends, and iii. just before it reaches the end of one cycle (just before instant i.). i. potential and kinetic, ii. potential and kinetic, iii. kinetic i. potential, ii. potential and kinetic, iii. potential and kinetic i. potential, ii. kinetic, iii. potential and kinetic i. potential and kinetic, ii. kinetic iii. kinetic
- Test Your Understanding Apply and Analyze 14. Consider the following reaction (in water): HCl H+ + Cl Name the reactant(s) and product(s). Does the expression indicate that the reaction is reversible? Could HCl be used as a buffer?MATHEMATICAL Calculate the isoelectric point of each of the following amino acids: glutamic acid, serine, histidine, lysine, tyro- sine, and arginine.MATHEMATICAL You do an enzyme kinetic experiment and calculate a Vmax of 100 mol of product per minute. If each assay used 0.1 mL of an enzyme solution that had a concentration of 0.2 mg/mL, what would be the turnover number if the enzyme had a molecular weight of 128,000 g/mol?
