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1. A sample of sodium carbonate (Na2CO3), which is a base (assume the titration endpoint is reached when one proton has been transfered, producing NaHCO3), with a mass of 0.2892 g is dissolved in water and used to standardize a solution of perchloric acid. An endpoint is reached when 32.03 mL of perchloric acid has been added. Determine the molarity (in mol/L) of the perchloric acid solution. Report your answer to four significant figures.
2. The standardized perchloric acid solution is then used to titrate 41.10 mL of a solution of sodium lactate (NaC2H5OCOO). An endpoint is reached when 18.22 mL of perchloric acid has been added. Determine the molarity (in mol/L) of the sodium lactate solution. Report your answer to four significant figures.
A gas occupies 4.04 L at 860 torr and 10C. What volume will it fill if the pressure is changed to 731 torr and the temperature is raised to 43 0C?
Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
A gas is collected over water at a certain temperature. The total pressure is 762 torr. The vapor pressure of water at this temperature is 17 torr.
Calculate the molar mass (g/mol) of a gas whose root mean square speed is 796 m/s at 512 K.
when a gold nugget with a mass of 521 g is added to 50.0 ml of water the water level rises to 77 ml what is the density of gold
121 cal of heat are added to 50.0 g of water initially at 15.0 (degrees celsius). What is the final temperature of the water.
Determine the pH of a buffer prepared by mixing 0.675 moles of HC2H3O2 and 0.575 moles of NaC2H3O2 in enough water to give 1.00 liter of solution.
Calculate a lattice energy for (in kilojoules per mole) using the following information.
Describe the preparation of 1L solution of 0.02M Tris buffer, PH 7.8. 3. What volume of glacial acetic acid (d= 1.06g/ml) and what weight of solid potassium acetate are required to prepare 5 liters of 0.2M acetate buffer,PH 5.0?
calculate the amount of sodium nitrate in mg in one liter if 3.8mg of nitrate was detected in one liter of water.
The lengths of chemical bonds in H2 and in other compounds formed from hydrogen isotops is about .74 x 10^-10 m. Estimate the bond length in molecules where the muon replaces the electron.
Determine the mole fraction of each component to at least three significant figures.
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