Calculations in Visual C#

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The volume of titrant added is calculated by the difference between measurements 2 and 3 The volume of titrant is then converted to liters The pipeted volume is converted to moles by multiplying the liters of solution by its molarity The moles of titrant are determined from the mole ratio in the balanced chemical equation for the reaction The molarity of the solution is calculated by dividing the moles of titrant by the liters of titrant used
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Common oxidants are potassium permanganate and potassium dichromate Iron(II) and oxalates are commonly chosen as reductants Refer to Figure 193 for general titration set-up
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Experiment 9: Mass/Mole Relationships in a Chemical Reaction
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The initial masses of various reactants may be determined and then converted to moles A similar calculation may be done for the products (See the Stoichiometry chapter)
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analytical balance Erlenmeyer flask beaker(s) graduated cylinder desiccator hot plate
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1 mass of samples of different reactants 2 mass of samples of different products
Calculations
Convert the masses of the reactants and products to moles using their molar masses Using the mole ratios from the balanced chemical equation, it is possible to determine how much material should react or be produced These calculated values can be compared to the observed values
Comments
Nearly any reaction may be used
Experimental 289
Experiment 10: Finding the Equilibrium Constant
Synopsis
The value of an equilibrium constant is calculated by measuring (or calculating) the equilibrium concentrations of the reactants and products A calibration curve is constructed by measuring the absorbance of a colored solution versus its concentration Known quantities of the reactants are mixed, and the calibration curve is used to determine the concentration of the colored substance in the resultant solution (See the Equilibrium chapter)
Equipment
analytical balance test tube(s) or cuvettes pipet volumetric flask spectrophotometer
Spectrophotometers
Some of the AP recommended experiments require the use of a spectrophotometer A spectrophotometer is an instrument that is used to measure the amount of light absorbed (or percentage transmitted) by a particular solute in a solution In order to determine the absorbance (A) of a sample, the instrument is set to a particular wavelength; a solution, contained in a holder called a cuvette, is placed in a sample chamber and an absorbance reading is taken This procedure may be repeated for other solutions or wavelengths The cuvette is a standard size to ensure a given path length (b) A plot of absorbance versus wavelength may be used to identify a component of a solution or to determine the wavelength of maximum absorbance (maximum molar absorptivity = a) A more common plot is one of absorbance versus concentration For this type of plot the instrument is set at the wavelength of maximum molar absorptivity and the absorbances of solutions of various known concentrations (c) are measured This plot should be a straight line This linear relationship is called Beer s law and has the form of A = abc The concentration of an unknown solution may be determined by measuring its absorbance and using the plot to find its concentration
Measurements
Calibration Curve
Quantities of one or more reactants are pipeted into a volumetric flask The solutions are diluted to a known volume in the volumetric flask Measurements of the absorbance are made with a spectrophotometer
Equilibrium Concentrations
Different quantities of various reactants are pipeted into a volumetric flask and diluted to a known volume Measurements of the absorbance of these solutions are made with a spectrophotometer
Calculations
Calibration Curve
The concentration of the absorbing species is calculated using the initial pipeted volumes and the final volumetric flask volume These concentrations are plotted versus the absorbance of the solution
Equilibrium Concentrations
The final concentration of each reactant is calculated from the final volume and the volume and concentration of the solution pipeted into the volumetric flask The calibration curve is used to find the equilibrium concentration Using the balanced chemical equation, the equilibrium concentrations of the other substances may be calculated
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The equilibrium concentrations are inserted into the reaction quotient expression, and the equilibrium constant is calculated
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