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The nitrate stock standard utilized in this experiment is 1000ppm NO3- prepared by dissolving 163mg of dried KNO3 in 100mL water. NaNO3 can also be utilized if no KNO3 is available. Explain what weight of NaNO3 must be used to make a 100mL solution of 1000ppm NO3-?
Calculate the OH concentration of a solution of Na2CrO4 0.225M. (the sodium salt of chromic acid). (Chromic acid is H2CrO4, a diprotic acid, Ka1= 1.80x10^-1, Ka2=3.20x10^-7 & Kw=1.00x10^-14).
Assume that the volumes are additive, the specific heat of the solution is 4.18 Jg-1°C-1 and that the density of the solution is 1.00 g mL-1 Calculate the enthalpy change, ?H in kJ for the reaction
If you used 8400 kilojoules you expend in energy in one day to heat 50,000 g of water to 20 degrees C, what would be the irse in temperature? What would be the new temperature of the water?
Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.
The leaves of a Rhubarb contain high concentrations of diprotic oxalic acid (HOOCCOOH) and must be removed before the stems are used to make rhubarb pie. If pKa1=1.23 and pKa2=4.19, what is the pH of a .0282 M solution of oxalic acid
Salicylic acid reacts with acetic anhydride at the phenol group rather than at the carboxylic acid group. Briefly explain why the phenol site is preferred over the carboxylic acid site.
The enthalpy of combustion of benzoic acid (C6H5COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be 3226.7 kj?mol.
calculate the value of theequilibrium constantkeqfor the above reaction at 298.15kelvin? use the standard gibbs free
he reduction table in your notes, calculate the standard cell potential for the following reactions. 2 Al3+(aq) + 3 Pb(s) 2 Al(s) + 3 Pb2+(aq)
it is only through the study of isolated and purified elements and their combination that one can observe
Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 3.00 multiplied by 102 mL of solution and then titrate the solution
100 ml of 1 M acetic acid (pKa 4.76) are placed in a flask. what is the ph if 2mL of 1 M KOH are added, and the total volume is adjusted to one liter with water.
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