The controlled variables are the hydrochloric acid and the total volume of each

# The controlled variables are the hydrochloric acid

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7 1 1 Exercise 1 Page 3 of 7
EXERCISE 1 Page 4 of 7 Known: group Tris stock solution (0.5 M ) Acid Volume Added Measured pH initial pH 0 9.01 mL Acid added 0.2 8.04 stop if pH falls below 1 insert more rows as needed 0.4 7.8 0.6 7.52 0.8 7.34 1 7.02 1.2 6.51 etc. Known: group sucrose stock solution (1.5 M ) Acid Volum e Added initial pH 0 mL Acid added 0.2 stop if pH falls below 1 insert more rows as needed 0.4 0.6 0.8 1 1.2 etc. Known: group sucrose & Tris working soln Acid Volum e Added initial pH 0 mL Acid added 0.2 stop if pH falls 0.4 Exercise 1 Page 4 of 7
Group Members: _____ _______________ _____________________________Exercise_______Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ below 1 insert more rows as needed 0.6 0.8 1 1.2 etc. Unknown Solution #2 Acid Volum e Added Measur ed pH initial pH 0 8.7 mL Acid added 0.2 6.82 stop if pH falls below 1 insert more rows as needed 0.4 6.33 0.6 4.84 0.8 4.79 1 4.73 1.2 1.49 etc. (3)INDIVIDUAL: For the following question, obtain the values for X,Y,and Z from your LabInstructor.A student, who has not learned how to properly prepare solutions, added X gof Y solidmaterial (FW = ???) to exactly 150.0 mLof dH2O and assumed that a 0.5 Msolution hadbeen prepared. The total solution volume increased to Z mLafter the the solution wasthoroughly mixed and the solid material was dissolved. X=10.059gY= Deoxyribose (134.13 g mol−1)Z=165 mL(a.)Determine the actual concentration of the solution prepared by the student. Exercise 1 Page 5 of 7
EXERCISE 1 Page 6 of 7