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Laboratory Procedure
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Laboratory Procedure
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16 Questions

1. Which of the following techniques is most appropriate for recovering solid NH4NO3 from an aqueous solution of NH4NO3?
2. A student dissolves a 20.0 mol sample of acetic acid, a weak acid, into 1 kg of water to make a 20.0 molal solution. Assuming no other information is available to the student, which of the following is the best way to determine the molarity of the solution?
3. Which of the following pieces of laboratory glassware would be used to most accurately transfer a 10.00-mL sample of solution?
4. Which of the following is an acceptable laboratory practice?
5. Which of the following procedures would allow a student to boil water at a temperature significantly above 100°C in a laboratory in which the temperature is 22°C and the pressure is 1 atm?
6. A 98-gram sample of phosphoric acid, H3PO4 (a weak acid), is dissolved in 1 kg of water. Assuming no other information is available, which of the following procedures is the best way to determine the molarity of the solution?
7. Which of the following measures of concentration changes with temperature?
8. Used to determine the unknown concentration of a known reactant
9. The proper procedure for the dilution of concentrated NaOH is to slowly add the base to a beaker of water rather than slowly adding water to the beaker of base. This precaution is to ensure that
10. Used to determine the concentration of a solution of KMnO4
11. A student accidentally splashes a concentrated, strong acid onto his bare skin. Which of the following is the safest and most effective course of action?
12. Used to determine if Na+, Mg2+, and/or Pb2+ ions are present in a solution
13. Used to separate pigments in a mixture
14. A student weighs out 0.20 mol of glucose to prepare a 2-M glucose solution. Which of the following pieces of laboratory equipment is most appropriate for preparing this solution?
15. Can be used to measure the conductivity of a solution
16. A student determined the density of a pure liquid at 25°C by measuring its mass with an electronic balance and measuring its volume in a clean, dry 50.00-mL volumetric flask. On the basis of this information and the measurements shown in the table below, to how many significant digits should this density be reported?

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