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Calculate the pH of a buffer solution that is 0.12 M lactic acid (HC3H5O3)and 0.1 M sodium lactate (NaC3H5O5). Ka for lactic acid = 1.4 x 10-4.
Question: Galactose and glucose compose lactose, which is referred to as milk sugar. What is the molecular formula of galactose if the empirical formula is CH2O, and the approximate molar mass is 18
Use the van der Waals equation of state to plot the compressibility factor, Z, against P for methane at 180K and 250K. calculate Z as a function of V/n and P as a function of V/n, and then plot Z V
A solution of 0.640 g of azulene in 100.0 g of benzene boils at 80.23oC. The boiling point of benzene is 80.10oC; the Kb is 2.53 oC/molal.
Explain why the Rf values changed when the eluant was changed from 100% petroleum ether to a 95:5 mixture of petroleum ether-ethyl acetate. Why UV light is not a useful visualization technique in e
Cesium atoms are the largest naturally occurring atoms. The radius of a Cs atom is 2.62 angstroms. How many Cs atoms would have to be laid side by side to give a row of Cs atoms 1 inch long? (assume
The method of initial rates involves substituting the initial reactant concentrations into rate calculations. When you do the experiment, you will be given KMnO4 and H2C2O4 solutions of known concen
For the reaction A+B+C → D+E, the initial reaction rate was measured for various initial concentrations of reactants. What is the reaction order with respect to A?
What law states that mass and energy can be changed from one form to another but their sum remains constant?
Potassium metal is very reactive with liquid bromide. The result of the reaction is the formation of a ionic solid. Explain what happens to the elements when they form the ionic compound, and identi
Fifty grams of NH4Cl was dissolved in 100 mL of water. The calculated delta heat for the reaction was +15.2 kj. What is the delta temperature obtained in this experiment?
0.8720-g sample of mixture consisting solely of sodium bromide and potassium bromide yields 1.505 g of silver bromide. What are the percentages of the two salts in the sample.
EDTA was used for the aqueous solution titration to determine the amount of calcium ions in the sample. Calculate the fraction of EDTA that exists as Y^4- at pH 10, and from this calculate pCa in 10
The rate constant of a reaction is 8.50 10-5 L/mols at 195°C and 9.30 10-3 L/mols at 258°C. What is the activation energy of the reaction?
Differentiate between alkenes and alkynes, cis isomers and trans isomers. Describe how cis- trans isomers are used for night vision.
Write the net ionic equation for the following oxidation-reduction reactions. Substances labeled (aq) are soluble and ionic.
If solute ( Camphor) assigned were known, determination of the molar mass via frezzing -point depression could determine the identity. What other tests could have been performed on the unknown solu
An unknown molecule contains only iodine and fluorine, and it is 57.2% I by mass. What is the electron domain geometry of iodine in this molecule?
Draw all constitutional isomers of C3H6O. For each of the constitutional isomers, show possible stereoisomers. Are the melting points of the stereoisomers different?
What volume of water should be added to 600 mL of ethanol in order to have a solution that boils at 95 degrees Celsius?
Calculate the molality of C2H5OH in a water solution which is prepare by mixing 50.0 ml of C2H5OH with 100.0 ml of H2O at 20°C. The density of C2H2OH is 0.789g/ml at 20° and water is 0.99970g/
How many grams of naphthalene (C10H8) must be added to 25.00 g of CCl4 so that the vapor pressure of CCl4 over the solution is 483 mm Hg? Assume the vapor pressure of naphthalene at 65 degrees Celsius
Hydrogen peroxide is a powerful oxidizing agent used in concentrated solution in rocket fuels and in dilute solution as a hair bleach. An aqueous solution of hydrogen peroxide is 30.0% m/m and has a
Consider another expandable balloon is filled with nitrogen gas. The density of the gas is 1.24 g/L and the outside pressure is 1.05 atm. What is the temperature of the gas?
Predict the products, write the balanced molecular equations, and then write the balanced net ionic equation for the following reagents that are mixed or heated.