Exam (elaborations)
TITRATION LAB EXPERIMENT GENERAL CHEMISTRY 1
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Materials Reagents Procedures and experimental question
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LAB EXPERIMENT bicarbonate in the sample and compute forGENERAL CHEMISTRY 1 percentage error as I will disclose to you the
correct concentration of the baking soda
TITRIMETRY – a chemical analysis in which the solution.
concentration of a substance (analyte) is
determined by its complete reaction with
known amount of titrant
Materials:
Pipette (10 mL)
Aspirator
Erlenmeyer flask (250 mL)
Beaker
Reagents
Baking soda (NaHCO3)
Muriatic acid (HCl)
Bromothymol blue indicator
Distilled water
Personal Protection:
Gloves (Latex or Plastic)
(Titration of sodium bicarbonate with
hydrochloric acid)
Prepare 250 mL 0.75 M HCl titrant using
commercial grade muriatic acid (10-29% v/v)
(=1.21 for pure HCl). Measure calculated
volume of concentrated HCl place it in a 250 mL
volumetric flask half filled with water, shake it
gently then fill the volumetric flask with distilled
water up to 250 mL mark.
Add 4-5 drops of Bromothymol
indicator to 20 mL of baking soda solution (that
I will give to you for you to analyze). Determine
the amount of sodium bicarbonate by
controlled addition of HCl titrant. Stop adding
titrant when the color of the bicarbonate
solution is similar to the reference solution
(Your reference solution is a titrated sodium
bicarbonate at its endpoint, which also I will
give to you)
After titrating the baking soda,
determine the concentration of the sodium
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