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A. (1) How many mL of boiling water are required to dissolve 28.00g of phthalic acid? (2) If the solution were cooled to 14 deg C, how many grams of phtahlic acid would crystallize out?
B. What is the reason for using activated carbon during a recrystallization?
C. Why is gravity filtration and not suction filtration used to remove insoluble suspended impurities and charcoal from a hot solution?
D. While performing a vacuum filtration on a Hirsch funnel to collect the crystallized phthalic acid, you find that most of your solid is stuck to the walls of the tube or flask in which it has been cooled and crystallized. (1) Can you rinse the container with some liquid to get the solid out and onto the Hirsch funnel? If so, what liquid specifically?(2) Explain WHY this liquid.
Chemists studied the formation of phosgene by sealing 0.73 atm of carbon monoxide and 0.98 atm of chlorine in a reactor at a certain temperature. The pressure dropped smoothly to 1.32 atm as the system reached equilbrium.
determine the mass of this substance should evaporate in order to freeze 190 grams of water at 25 degree celsius
The standard entropy of Pb(s) at 298.15k is 64.80 jk-1 mol-1. assume that the heat capacity of Pb(s) is given by Cp,m (Pb,l)/jk-1mol-1 = 32.51 -.00301 t/k. calculate the standard entropy of Pb (l) at 650 C. calculate delta H for the transformation..
To obtain the same antifreeze protection requires 76 of propylene glycol to replace each 62 of ethylene glycol. Calculate the mass of propylene glycol required to replace 1.00 of ethylene glycol. The density of ethylene glycol is 1.12.
Calculate the cell potential (Ecell) of an electrochemical cell with Mg/Mg2+ and Fe/Fe2+ electrodes. [Mg2+] = 0.200 M and [Fe2+] = 0.050 M.
If 25.0 mL of AgNO3 is needed to precipitate all the Cl- ions in a 0.795 mg sample of KCl(forming AgCl), what is the molarity of the AgNO3 solution.
the oxidation of nitric oxide to nitrogen dioxide is2nog o2g -gt 2no2gif 100.0 ml of no at stp reacts with 400.0 ml of
For a particular reaction, ?H = 139.99 kJ and ?S = 298.7 J/K. Calculate ?G for this reaction at 298 K. Is this reaction spontaneous or unspontaneous?
Determine the atomic number and valence orbital that is filling for the element that would appear below radium in the periodic table.
the solubility of oxygen in lakes high in the rocky mountains is affected by the altitude. if the solubility of o2
a gas occupying a volume of 810. ml at a pressure of 0.970 atm is allowed to expand at constant temperature until its
Which of the following is the correct value for (delta)Go' (delta G naught prime: standard free energy change) for an equilibrium reaction in which 2A + B = C + 3D? The equilibrium concentrations for all chemical species is as follows:
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