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An ointment was examined for its zinc oxide content as follows- (a) a 0.7503-g sample of the ointment was combusted to volatilize organic matter, subsequent which the zinc was precipitated as zinc oxalate, filtered, and washed (b) the precipitate was dissolved in acid as well as was titrated with a 0.40136 N permanganate solution, requiring 15.36mL to reach equivalence. Find out the percent zinc oxide in the ointment.
Write the equation of the cell reaction and indicate cathode and anode half-cells for the electrochemical cell formed from a Mg/Mg^2+ half-cell and In/In^3+ half-cell.
To a second 25.00 mL part, 10.00 mg of lead was added and extracted into a second 10.00 mL portion of the same organic solvent. This solution gave A = 0.525. What was the concentration of lead, in mg/mL, in the original sample?
Write the balanced reaction and determine the mass of KNO3 that should be mixed with 6.1 g of sugar to produce optimally balanced rocket candy.
Calculate the concentration of C6H5NH3+ in this buffer solution Answer:1.9 M b) Calculate the pH after 4.0 g of NaOH(s) is added to 1.0 L of this solution
Nicotine is responsible for the addictive properties of tobacco. Assume Kb1= 1.05 x 10^-6 and Kb2= 1.32 x 10^-11. Determine the pH of a 0.00120 M solution of nicotine.
A chemist must prepare 0.9 L of sodium hydroxide solution with a pH of 13.40 at 25 C. He will do this in three steps: Fill a 0.9 L volumetric flask about halfway with distilled water
A 30 g sample of water at 280 K is mixed with 50 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
Explain the concentration of 2, 5-dimethylfuran in blood is directly proportional to the number of cigarettes smoked per day. Individuals who have a 2, 5-dimethylfuran concentration above 0.024 parts per billion (ppb)
There were two acid solutions: 0.1 M HCl and 0.1 M H2SO4 , 250 mL each in two identical volumetric flasks prepared by a lab technician. Unfortunately, she forgot to label them and there were no more concentrated acids left in the lab. She found 1L..
Describe reasons the paper's physical properties are different from the water's physical properties.
Rubidium has a heat of vaporization of 69.0 kJ/mol and an entropy of vaporization of 71.9 J/K mol. Calculate the boiling point of rubidium.
A certain metal oxide has the formula MO where M denotes the metal. A 36.46g sample of the compound is strongly heated in an atmosphere of hydrogen to remove oxygen as water molecules.
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