Dee Enaye pipetted 40 microlitters of her 50 mM NaCl solution into 10 mls of buffer. What is the concentration of salt in the buffer?
Dee Enaye pipetted 40 microlitters of her 50 mM NaCl solution into 10 mls of buffer....
If you have a 1.6 M NaCl solution and are now asked to make 50 mls of a 0.16 M NaCl solution. How would you do this? You may recognize that it is a 1:10 dilution and add (just type number) _____ mLs of 1.6M NaCl to (just type number) _____ mLs water.
14. To prepare a buffer, 50 mLs of 0.120 M NaOH was added to 30 mLs of 0.250 M HAc. a. Write the net ionic equation for the reaction. b. What is the molarity of the Ac present in the final solution? c. What is the molarity of the acetic acid in the final solution? d. What is the pH of the resulting buffer? cing conacity and which one has the least?
please answer ALL questions completely showing ALL work. micro liter as if Dee Enay pipetted sub of a 65 mg/ml Solution, how many_mg did She add to her reaction? Q2: How many grams of Ala (S04)18 Hao CMW clé 2 g/mol) would you ack to 200ml water to make a 20mm Stock Solution? 3 ! calculate the concentration of the unknown protein, and explain your work. Include what the dilution factor is ! 0.239 absorbance for 1:100 dilution Q4: You...
12. You need 500 mls of a HEPES buffered saline solution containing 21 mM HEPES, 137 mM NaCI, 5 mM KCI, 50 mM sodium citrate. 12. You need 500 mls of a HEPES buffered saline solution containing 21 mM HEPES, 137 mM NaCI, 5 mM KCI, 50 mM sodium citrate.
Question 2 1 pts You need to make a 500 mL buffer containing 35 mM NaCl and 50 mM Tris buffer. You already have a 5 M NaCl stock solution and a 1 M Tris stock solution. How much NaCl stock do you need (mL)?
A. 50 mM K2SO4, 10 mM NaCl, 20 mM MgCl2 --> V= 1 L B. 5 mM K2SO4, 100 mM NaCl, 5 mM MGCl2 --> V = 1 L A) What is the osmolarity differences across the membrane?
You are required to make a solution that contains 50 mmoles of buffer (its molecular mass is 121.1 g/mol), 300 mmoles of sodium chloride (its molecular mass is 58.44 g/mol), and 10% glycerol in a total volume of 0.75 L. Tell me (A) what weight of buffer and NaCl you will need, and (B) what volume of glycerol (diluted from a 100% stock concentration) you will need. Also, (C) what then makes up the additional volume to 0.75 L, and...
Which salt could be dissolved in a solution of H2PO4-1 to make a buffer? NaF NaCl Na3PO4 Na2HPO4
A 2.550×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3 mL . The density of water at 20.0∘C is 0.9982 g/mL. A) Calculate the molality of the salt solution. B) Calculate the mole fraction of salt in this solution. C) Calculate the concentration of the...
A 2.400×10−2 M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.4 mL . The density of water at 20.0∘C is 0.9982 g/mL. a. Calculate the molality of the salt solution. b. Calculate the mole fraction of salt in this solution. c. Calculate the concentration of...