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If a formic acid/formate buffer is 0.031 M in formic acid and has a pH of 3.91, what is the molar concentration of the formate ion? The pKa of formic acid is 3.75.
What is the chemical formula of the product formed from the reaction of calcium chloride and potassium oxalate? Make sure to include the correct number of waters of hydration.
You must determine the amount of acetic acid and sodium acetate required. The Ka of acetic acid is 1.8 X 10^-5. Show the calculations for the preparation of 100 mL of an acetic acid - sodium acetate
Question: A 0.100 M solution of a certain weak acid, HA, is found to have a pH of 2.45. Calculate the % ionization for the acid. Enter the answer as a decimal number with 3 decimal places. Do not en
The addition of anhydrous calcium chloride to the crude product obtained from the separation procedure often results in the product becoming clear (transparent). What causes the clearing?
If a carboxylic acid ester is exposed to an environment such as sweaty skin (acidic aqueous environment) for quite a while, what can happen? What would their fruity odors change to?
In the Grignard synthesis of triphenylmethanol experiment, the procedure states that the additions of bromobenzene, methyl benzoate and hydrochloric acids must be done slowly. What might if these we
Strychnine, C12H22N2O2, is a weak base. An aqueous solution of 0.0515 M strychnine solution has a pH of 10.48. What is the Kb for strychnine based on these measurements?
Compare in your mind 3 different liquids: pure ethanol, a 50% ethanol/water mixture and a 50 % ethanol/methanol mixture. Rank these three liquids in order of increasing Ptotal when each liquid is in
Question: A sucrose (table sugar, molar mass 342 g/mol) solution was made by dissolving 68.2g of sucrose in 800 g of water. What is the freezing point of this solution if Kf of water is 1.86 degrees
Will the temperature decrease shift the equilibrium toward the reactants or products for a reaction characterized by a positive reaction enthalpy and positive reaction entropy?
When a pure solvent freezes the temperature remains constant till all liquid is frozen (thus the freezing point). When the solvent in a solution freezes the temperature keeps decreasing. Explain why
Poly(propylene) is made of one kind of monomer. Give the two monomers used to make nylon 6,6. Why are two monomers needed to make nylon 6,6 while only one is needed to make poly (propylene)?
Question: 153 grams of metal have a specific heat of 0.061 cal/g C and at a temp of 99.1C is added to 85.0 grams of water at 23.5C What will be the final temp of the water when equilibrium is reache
Question: A typical aspirin tablet contains 324mg aspirin(C9O4H8), a monoprotic acid Ka=2.8*10^-4. A monoprotic acid donates a single proton. If you dissolve two aspirin tablets in a 300 mL glass of
Question: A water carbonating plant operates by providing carbon dioxide at 5.0 atm. Estimate the molar concentration of CO2 in carbonated water it produces at 25 ºC.
Which one of the following alkyl halides gives the highest ratio of substitution to elimination on treatment with sodium ethoxide in ethanol, and why?
The value of the equilibrium constant for the chemical equationis Kp= 85 at 280 degrees Celcius. Calculate the value of Kp at 280 degrees Celcius for the equation
A person ate 0.941 pound of cheese (an energy intake of 7530 kJ). Suppose that none of the energy was stored in his body. What mass (in grams) of water would he need to perspire in order to maintain
Calculate the work done if a gas is compressed from 7.8 L to 2.6 L at constant temperature by a constant pressure of 2.1 atm, and give your answer in units of joules. (1 L · atm = 101.3 J)
At 20 degrees Celcius the equilibrium pressure of NH3 (g) is 62 Torr. Calculate the value of Kp for this equation and include the corresponding units.
Volume of naoh solution used for flask number one or run 1 : 17.56 ml. How to calculate the molar mass of this unknown metal carbonate for run one?
The value of Kp for the reaction is 4.3x10^4 at 648 K. Determine the equilibrium partial pressure of NH3 in a reaction vessel that initially contained 0.900 atm N2 and 0.500 atm H2 at 648 K.
The change in enthalpy (delta S standard) for a reaction is -31.7 kJ/mol. The equilibrium constant for the reaction is 4.4×103 at 298 K. What is the equilibrium constant for the reaction at 644
Ammonia (NH3) decomposes to hydrogen and nitrogen and 22.0 Kcal/ mol of energy absorbed. How much energy is absorbed when 7.69 mol of N2 is formed?