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Describe how you will prepare a buffer system of 0.50 M nitrous acid and sodium nitrite, pH 3.60.
Show how a buffer system will not drastically change its pH by addition of a certain amount of a strong acid or base. Use 0.50 M buffer system and show how the pH will change upon addition of 10.0 m
Show mathematically that addition of a common ion will decrease the ionization of a weak acid OR a weak base
Show that Ka Kb = Kw for a weak acid and its conjugate base OR a weak base and its conjugate acid, using the equilibrium expression for each.
A sample of the Dead Sea Scrolls gives a ^14C decay rate of 731 disintergrations/h. A modern sample gives 920 disintergrations/h. Estimate the age of the Scrolls from these data.
If 2.50 g CuSO4 are dissolved in 8.0 x 102 mL of 0.25 M NH3, what are the concentrations of Cu2+, Cu(NH3)42+, and NH3 at equilibrium
Write the condensed and structural formulas, as well as the names for the isomers of C3H5Cl3
What is the pH of a solution with a hydronium ion concentration of 1.0 x 10-3 mole per liter
A modern sample gives 920 disintergrations/h. Estimate the age of the Scrolls from these data
What is the equilibrium concentration of SCN if the Kc=400 for the following reaction at equilibrium if the [Fe3+]=2.00E-3 M and FeSCN 2+ = 4.00E-1M
Which two reagents below would you choose to synthesize 3-ethyl-2-phenyl-2-pentene using the Wittig procedure? (triphenylphosphine, solvents, and a base are provided)
Identify the charged groups in the peptide shown below at pH=1 and at pH=7. What is the net charge of this peptide at these two pH values? val-met-ser-Ile-phe-arg-cys-tyr-leu
If you have 100ml of a .1M tris buffer at PH 8.3 and you add 3.0 ml HCl what will be the new pH? (PKa of Tris = 8.3)
The amount of calcium in a 15.0-g sample was determined by converting the calcium to calcium oxalate, CaC2O4. The CaC2O4 weighed 12.8 g. What is the percent of calcium in the original sample
reaction takes place in acidic solution, \rm H_2O{(l)} and \rm H^+{(aq)} will be involved in the reaction. Places for these species are indicated by the blanks in the following restatement of the eq
A current of 0.0100 A is passed through a solution of rhodium sulfate, causing reduction of the metal ion to the metal. After 3.00 h, 0.038 g of Rh has been deposited. The charge on Rh is +3. What i
what is the concentration of glyceraldehyde-3-phosphate? Assume a temperature of 25.0 °C. The constant R = 8.3145 J/(mol·K)
What proportion of I2 molecules are in the ground and the first two excited levels at the two temperatures. Calculate the vibrational contribution to the molar entropy of I2 at the two temperatures
Neutron stars are believed to be composed of solid nuclear matter, primarily neutrons.If the radius of a neutron is 1.0 × 10-13 cm, calculate the density of a neutron in g/cm3. (volume of a sp
An average human DNA molecule has 5 X 10^8 binucleotides (rungs on the DNA ladder) of four different kinds. If each rung were a random choice of one of these four possibilities, what would the resid
Draw the structure of the dimer. Water (circled) is eliminated when the bond between the monomers forms. Circle the atoms of the ester functional group.
The Group 5A elements can form molecules or ions with three, five or six covalent bonds. Predict the molecular structure and hybridization of the following substances: NH3, AsCl5 and PF6-. Why doesn
Many hospitals, and some doctors\' offices, use radioisotopes for diagnosis and treatment, or in palliative care (relief of symptoms such as pain). Some radioisotopes used in medicine are listed bel
The block of iron is smaller than the block of aluminum. Both objects have the same volume.