Chemistry - Dilution in volumetric analysis - worked example
Dilution in volumetric analysis - worked example
The following procedure was followed by a student analysing a household
cleaning agent for ammonia content.
A 20.0 mL sample of the cleaning agent was weighed and added to a clean
250 mL volumetric flask. The flask was then filled to the calibration mark
with distilled water and the solution thoroughly mixed.
20.0 mL aliquots of this diluted cleaning agent solution were then
titrated with 0.120 M HCl(aq) using methyl orange indicator.
The following experimental data were recorded:
mass of cleaning agent used = 21.392 g
average V(HCl) used = 25.25 mL
(a) _n_(HCl) used
(b) _n_(NH3) in 20.0 mL of diluted cleaning agent
(c)_ n_(NH3) in 20.0 mL of cleaning agent
(d) the molarity of the cleaning agent with respect to NH3(aq)
(e) the percentage, by mass, of NH3 in the cleaning agent
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