Lab #5 – Complexometric Titrations of Aluminum and Magnesium in “Homemade Antacid”
Name and ID: ________________________________________________________________
Unknown letter ______
Protocol #1: Determine Total Aluminum and Magnesium Content
- Actual mass of powder sample _____
___________ g
- Volume of stock sample solution prepared _____________ mL
Hydrotalcite (HT) molecular formula Mg6Al2CO3(OH)16·4(H2O) = 603.98 Da
| Trial 1 | Trial 2 | Trial 3 | |||
Exact molarity of stock (Na2H2EDTA ▪ 2H2O) solution _________________ Average moles _____________________
Standard deviation ______________ |
# moles of Aluminum and Magnesium in 10 mL aliquot ________________
# moles of Aluminum and Magnesium in stock unknown sample _______________
# milligrams of hydrotalcite (HT) in sample ______________ [Hint, use molar conversions!]
# milligrams Magnesium in sample____________
# milligrams Aluminum in sample ____________
Attach all calculations and show all work.