Methods for Concentration Expression in Solutions
Learn about different methods like formality, morality, normality, percent concentration, parts per million, and specific examples for preparing solutions in lab experiments.
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Presentation Transcript
Experiment 2 Method for the Expression of concentration 1- Formality the number of gram- formula weights of solute in one liter of solution ?? ??? 1000 ? = ???
2- Morality the number of gram- molecular weights (or moles) in one liter of solution ?.?? 1000 ?? ? = ??? 3-Normality: the number of gram- equivalent weight in one liter of the solution ? = ??.?? 1000 ?? ???
Percent Concentration ???? ? ?? ?????? ???? ? ?? ???????? 100 Weight percent= ?????? ?? ?????? ?????? ?? ???????? 100 Volume percent = ???? ? ?? ??????.? ?????? ?? ???????? ?? 100 Weigh- Volume percent=
Parts per million ???? ? ?? ?????? ???? ? ?? ???????? 1.000.000 PPm= The Dilution before dilution = after dilution C1V1 = C2V 2
1-Solids a- Preparation (0.1N)of NaOH in250 ml ?? .???1000 ?? N = ??? V ml = 250 Eq. wt = Wt = X
2 Liquids b-Preparation of (0.1N) HCL from concentrated HCL ??? 1000 N(HCL ) = ??????????????? % ?? .??????? Specific gravity = 1.18 Eq.wt of HCL = 36.5 38 % ? ? of HCL is obtained from the reagent bottle ... N concentrated HCL = 12
To calculate the volume of concentrated HCL that should be taken to prepare 250 ml of (0.1N) HCL . Conc.HCL = N1 V1 12 X V1 V1 = ? diluted HCL = N2 V2 = 0.1 X 250
