Question 5. Circle the best answer for part a) and provide a number for part b). a) You work as a summer student in a lab to help a professor in her research. One day she left on your bench a small vial containing 8 g of a new antibiotic powder and a note asking you to prepare 20 ml of a 1M solution while she attends a Faculty meeting (use water to make the solution, and by the way, the molecular weight of the antibiotic is 400 g/mol, she wrote). When the professor comes back from the meeting: A You give your solution to the professor and thank her for having calculated the exact amount of powder needed. (but you think that she could have told you that B You return the leftover 2 g to the professor together with the solution. C You tell her that there is not enough powder and you need 2 g more to prepare this solution. b) if you used 0.5g of that antibiotic powder to make 20 ml of solution, what is the % concentration of this solution?

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Question 5. Circle the best answer for part a) and provide a number for part b).
a) You work as a summer student in a lab to help a professor in her research. One day she left
on your bench a small vial containing 8 g of a new antibiotic powder and a note asking you to
prepare 20 ml of a 1M solution while she attends a Faculty meeting (use water to make the
solution, and by the way, the molecular weight of the antibiotic is 400 g/mol, she wrote). When
the professor comes back from the meeting:
A You give your solution to the professor and thank her for having calculated the exact amount
of powder needed. (but you think that she could have told you that
B You return the leftover 2 g to the professor together with the solution.
C You tell her that there is not enough powder and you need 2 g more to prepare this solution.
b) if you used 0.5g of that antibiotic powder to make 20 ml of solution, what is the %
concentration of this solution?
Transcribed Image Text:Question 5. Circle the best answer for part a) and provide a number for part b). a) You work as a summer student in a lab to help a professor in her research. One day she left on your bench a small vial containing 8 g of a new antibiotic powder and a note asking you to prepare 20 ml of a 1M solution while she attends a Faculty meeting (use water to make the solution, and by the way, the molecular weight of the antibiotic is 400 g/mol, she wrote). When the professor comes back from the meeting: A You give your solution to the professor and thank her for having calculated the exact amount of powder needed. (but you think that she could have told you that B You return the leftover 2 g to the professor together with the solution. C You tell her that there is not enough powder and you need 2 g more to prepare this solution. b) if you used 0.5g of that antibiotic powder to make 20 ml of solution, what is the % concentration of this solution?
Question 4.
You are on a field trip with your professor and he asks you to make a fixative solution to collect
and preserve specimen. You are told to prepare 200 mL of fixative solution containing 30%
formaldehyde (vol/vol), 1X glycerol and 2.5 mM sodium chloride (NaCI). In the field trip van you
find a stock of 100% pure formaldehyde (liquid), a 10X glycerol stock (liquid), plenty of water
and a stock solution of 5M NaCl. There are also all kinds of pipets, cylinders and beakers to
measure volumes.
1. a) provide calculations and describe the process of making the fixative solution?
Transcribed Image Text:Question 4. You are on a field trip with your professor and he asks you to make a fixative solution to collect and preserve specimen. You are told to prepare 200 mL of fixative solution containing 30% formaldehyde (vol/vol), 1X glycerol and 2.5 mM sodium chloride (NaCI). In the field trip van you find a stock of 100% pure formaldehyde (liquid), a 10X glycerol stock (liquid), plenty of water and a stock solution of 5M NaCl. There are also all kinds of pipets, cylinders and beakers to measure volumes. 1. a) provide calculations and describe the process of making the fixative solution?
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