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A 50.00 mL aliquot of a hard water sample is titrated with 15.00 mL of 0.0100 M EDTA, using Arsenazo indicator. A second 50.00 mL aliquot is made strongly alkaline with sodium hydroxide. A precipitate results. Calcein indicator is added to the solution. The sample then requires 10.00 mL of 0.0120 M EDTA for titration. Calculate for this sample (a) the molarity of the calcium present, (b), the molarity of the magnesium present, and (c) the total hardness of the water (as ppm of CaCO3 and MgCO3).
You are investigating the metabolism of glutamic acid in E coli, which enters the TCA cycle as a-Ketoglutarate following an initial transamination reaction.
When 28.0 ml of 0.500 M H2SO4 is added to 28.0 ml of 1.00 M KOH in a coffee-cup calorimeter at 23.50 degrees Celsius, the temperature rises to 30.17 degrees Celsius. Calculate the delta H of this reaction.
A proton in a linear accelerator has a de Broglie wavelength of 117pm. what is the speed of the proton?
What is the osmotic pressure of a solution formed by dissolving 44.4mg of aspirin C9H8O4 in 0.355 L of water at 25 degress C.
According to the second law of thermodynamics, the change in the entropy of the universe (DeltaSuniv) during a spontaneous reaction
the activation energy for the reaction involved in the souring of raw milk is 75kj. milk will sour in about 8 hours at 21 degrees c. how long will raw milk last in refrigeratior maintained at 5 degrees c? assume rate constant to be inversely propo..
What is the final temperature of a mixture of that 5.00 x 102 mL of hot water at 95.0°C and 475 g of -12.0°C ice cubes? (NOTE that in this process, the ice heats up to its melting point, melts, and then heats to the final temperature of the mixtur..
A sample of oxygen gas is collected over water at 25 degrees C and a total pressure of 637 torr. The volume of the gas collected is 500.0 mL. What mass of oxygen is collected? The vapor pressure of water at 25 degress C is 23.8 torr.
What is the atomic radius of each atom that composes it If the length of a face centered cubic unit cell is 0.200 nm,?
As mentioned in the text, Ni3Al is used in the turbines of aircraft engines because of its strength and low density. Nickel metal has a cubic close-packed structure with a face-centered cubic unit cell
One method used to store energy during times of low demand is by pumping water uphill into a reservoir. When energy demand exceeds the output produced by power plants
A 0.300 M solution of an acid, HZ, has a pH = 1.301. What is the value of the ionization constant, Ka, for this acid?
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