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1. The mass percentage of chloride ion in a 25.00-mL sample of seawater was determined by titrating the sample with silver nitrate, precipitating silver chloride. It took 42.58 mL of 0.2997 M silver nitrate solution to reach the equivalence point in the titration What is the mass percentage of chloride ion in the seawater if its density is 1.025 g/mL
2. The arsenic in a 1.22-g sample of a pesticide was converted to AsO43- by suitable chemical treatment. It was then titrated using Ag+ to form Ag3AsO4 as a precipitate.
(a) What is the oxidation state of As in AsO43- ?
(b) Name Ag3AsO4 by analogy to the corresponding compound containing phosphorus in place of arsenic.
(c) If it took 25.0 mL of 0.102 M Ag+ to reach the equivalence point in this titration, what is the mass percentage of arsenic in the pesticide?
the volume of blood in the body of a certain deep-sea diver is about 7.00 l. blood cells make up about 55 of the blood
How many calories of heat are necessary to raise the temperature of 350 ml of water from 1.00oC to 5.00oC.
Problem- According to the chemiosmotic theory, the synthesis of 1 mole ATP is coupled to the movement of 4 moles of H+ ions from the low-pH side of the membrane to the high-pH side.
given 2 nobr g yields 2no g br2 gat equilibrium the concentrations of nobr 0.10m and br2 0.0050m . what is the
If the experimentally determined calibration curve is Absorbance = 12100 M-1 * [ferroin (M)] + 0.00230 and the measured absorbance of a sample solution is 0.367, what is the ferroin concentration in the measured solution
What intermolecular force holds together the 2 strands of DNA and is also important for the secondary and tertiary structure of proteins?
Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.342% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of hemoglobin
The oil is burned with 20.0% excess air, based on complete combustion of the carbon to CO2, the hydrogen to H2O, and the sulfur to SO2. The oil is burned completely, but 8% of the carbon forms CO. Calculate the molar composition of the stack gas.
a sample of hydrogen gas is generated in a closed container by reacting 2.050 g of zinc metal with 12.0 ml of 1.00 m
Determine the moles of NaOH b. Determine the moles of HCl c. Calculate the concentration of HCl
Two isomeric compounds A and B are known to each have a monosubstituted benzene ring and have the formula C6H5C3H5O2. Both are insoluble in water. When placed in diluted aqueous solution NaOH one of them dissolves. Provide structures for compounds..
What is the safest metal to use with a number of cleaning agents; even just H.2 0.; The heavier it is the better the resolve. A substance other then a metal with a comparable comparison would be nice. preferably something non corrosive.
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