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If you want to prepare a buffer with a pH of 4.30 with HOAc (acetic acid) and NaOac, what ration of NaOAc/HoAc should you use? (pKa of HOAc is 4.74)
Determine the following parameters of this circuit: How many watts would be produced from this circuit if the 6.00 V battery were replaced with a 586 V battery?
How many moles of NaOH are needed to raise the pH of a 4.50 L tank containing 0.00100 M HCl solution to 3.50?
In the Lewis formula that minimizes formal charge, what is the formal charge on the sulfur atom in sulfur trioxide, SO3?
A 499 mL sample of solution contains 32.0 g of CaCl2 Calculate the molar concentration of Cl - in this solution
Based on the stoichiometry, at what point does the limiting reactant change? show calculations to support your answer. The volume of acid HCL (10mL) is constant and mass of metal Mg (0.250g) is constant.
Clausthalite is a mineral composed of lead selenide (PbSe). The mineral adopts a NaCl-type structure. The density of PbSe at 25C is 8.27g/cm^3.
A 3.963-g sample of coal was burned in a tube furnace and the liberated SO2 was collected in dilute H2O2, which converts the SO2 to sulfuric acid:
What is the magnitude of the change in pH when 0.005 moles of HCl is added to 0.100 L of a buffer solution that is 0.100 M in CH3CO2H and 0.100 M NaCH3CO2?
Calculate the molar concentration of CO2 for a sample that has a pH of 6.220 and a HCO -3 concentration of 0.0020 M. For carbonic acid pKa1=6.33 and pKa2=10.35.
The metal barium crystallizes in a body-centered cubic lattice. If the density of barium is 3.51g/cm3, what is the unit cell volume?
What is the concentration of P retained in the soil (in mg P/kg)? What is the concentration of PO4 retained by the soil (in mg PO4/kg)?
How many grams of CaCl2 are needed to make 968.1 g of a solution that is 35.5% (m/m) calcium chloride in water? (Note that m/m has the same meaning as w/w.)
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