EXPERIMENT 3 DETERMINATION OF THE MOLAR MASS OF A METAL
OBJECTIVES
TYPES OF TITRATION
BACK TITRATION The concentration of an analyte is determined by reacting it with a known amount of excess reagent.
PROCEDURE
(A) Standardization of HCl solution Rinse a clean burette with 1.0 M NaOH. Record the initial burette reading to two decimal places
(A) Standardization of HCl solution
RESULT:
RESULT:
CALCULATION HCl + NaOH NaCl + H2O 1. Moles of NaOH = M X V (L) =___________ mol NaOH Given (NaOH prepared) Average titration
CALCULATION HCl + NaOH NaCl + H2O 2. From equation: 1 mol of NaOH react with 1 mol HCl ______mol NaOH = =_____mol HCl.
CALCULATION HCl + NaOH NaCl + H2O 3. Molarity HCl = n HCl V of HCl – use in titration =_____M
CALCULATION Mole s of HCl = M X V (L) = _______mol HCl (used)
CALCULATION Sampel 1: 1. Mol NaOH = M X V (L) = ____mol NaOH 2. Mole HCl = 1 mol NaOH react 1 mol HCl ______ NaOH = ______mol HCl = _____ mol HCl unreacted. HCl + NaOH NaCl + H2O Given (NaOH prepared) Titration Sample 1
CALCULATION Sampel 2: 1. Mol NaOH = M X V (L) = ____mol NaOH 2. Mole HCl = 1 mol NaOH react 1 mol HCl ______ NaOH = ______mol HCl = _______mol unreacted HCl HCl + NaOH NaCl + H2O Given (NaOH prepared) Titration Sample 2
CALCULATION Mole of HCl reacted = mol HCl used – mol HCl unreacted =_________mol HCl reacted. Mole M : 2 mol HCl react with 1 mol metal M _____mol HCl = = ____ mol M metal. SAMPLE 1
CALCULATION Mole of HCl reacted = mol HCl used – mol HCl unreacted =_________mol HCl reacted. Mole M : 2 mol HCl react with 1 mol metal M _____mol HCl = = ____ mol M metal. (reacted) SAMPLE 2
CALCULATION Molar Mass metal, M = mass of metal M mol metal M reacted SAMPLE 1 =___________g/mol.
CALCULATION Molar Mass metal, M = mass of metal M mol metal M reacted =___________g/mol. Average Mr metal M =__________g/mol Metal M is__________. SAMPLE 2
CALCULATION Metal M is__________.
DISCUSSION 1. Back titration is a method of volumetric analysis used to determine the concentration of an analyte by reacting it with___________________. 2. The amount of metal M can determined by measuring the amount of standard ____________required to react completely with it. 3. Metal M is ____________ 4. Determination the accuracy of the concentration of HCl and molar mass of __from (3)___ is depend on the________________________. 5. The metal is cut into smaller pieces because ______________________________
DISCUSSION ERROR PRECAUTION STEP 1. 2. 3.
CONCLUSION 1. The molarity of the standard HCl solution _______________________________. 2. The molar mass of the metal M ______________________________ 3. Metal M is _______________.
END OF SLAID