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83 solutions

Mass Percent

Q. Focmaldehyt content in pesticides is determined by weighing 0.3124g of liquid samples into a 50,0ml bottle of NaOH0,0996M solution. and 50,0ml H2O23%. The reaction occurred as follows OH- + HCHO + H2O2 HCOO- + 2H2O After cooling, the residual base is titrated with 0.05250M H2SO4 solution to 23.3ml. What is the percentage of HCHO in the wine sample? (M = 30,026g / mol)

Solved • Mar 26, 2020

Mass Percent

Q. A 11.1 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of the acid. If 21.5 mL of 0.815 M sodium hydroxide are required to neutralize the hydroiodic acid, what is the percent by mass of hydroiodic acid in the mixture?

Solved • Feb 23, 2020

Mass Percent

Q. 4. What is the percent by mass of an aqueous solution that is 3m ammonium sulfate?

Solved • Feb 12, 2020

Mass Percent

Q. A 2.650x10^-2 M solution of glycerol (C3H8O3) in water is at 20.0°C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 998.9 mL. The density of water at 20.0°C is .09982 g/mL. Calculate the concentration of the glycerol solution in percent by mass. Express your answer to four significant figures and include the appropriate units.

Solved • Feb 7, 2020

Mass Percent

Q. An aqueous solution of 0.292 M ammonia, NH3, has a density of 0.996 g/mL. The percent by mass of NH3 in the solution is _____ %.

Solved • Feb 4, 2020

Mass Percent

Q. An aqueous solution of 2.91 M potassium bromide, KBr, has a density of 1.24 g/mL. The percent by mass of KBr in the solution is _____ %.

Solved • Feb 4, 2020