CLNeres Oten Coege for estment ofChemistry HAW:- late the Formal and Molar concentrations of the constituents in 2.30 g of ethanol (g. fw- AD in 3.50 litres of aqueous solution. nontration (Molality) m la) in solvent (kg), molalit
CLNeres Oten Coege for estment ofChemistry HAW:- late the Formal and Molar concentrations of the constituents in 2.30 g of ethanol (g. fw- AD in 3.50 litres of aqueous solution. nontration (Molality) m la) in solvent (kg), molalit
Chapter7: Statistical Data Treatment And Evaluation
Section: Chapter Questions
Problem 7.16QAP
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Transcribed Image Text:iverity at Anbar
Cellege for Pure Belenees
Analytical Chemistry 1// 1 Stage
Dr. Bashar AbdulazeeR Mahmood
Peperiment of Chemistry
H.W:
date the Formal and Molar concentrations of the constituents in 2.30 g of ethanol (g. fw%3D
) in 3.50 litres of aqueous solution.
4) Molal concentration (Molality) m
The solution concentration produce from dissolved solute (mole) in solvent (kg), molality
oes not change with temperature and used for physicochemical measurements.
Example: Calculate the molal concentration for solution preparing from mixing 4 g NAOH with
500 g water.
W
1000
4 g
1000
Solution: Molality (m)
= 0.2 m
%3D
M.w
w (g)
40 g/mol
500
(5) Concentration by percent
Chemists frequently express concentrations in term of percentage Common methods include:
a. Weight percent (w/w):
It is the number of grams of solute per g of solvent or solution (w/w)
E-)
w of solute (g)
w of solution or sample (g)
w of solute (mg)
w of solution or sample (mg)
-%-
%3D
x 100 =
%3D
X 1
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