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Cobalt was utilized as an internal standard to examine a sample of titanium with atomic absorption spectroscopy. A mixture was prepared by combining a 4.50mL Ti solution of unknown concentration with 3.00mL of a 14.8 g/mL solution of Co. The atomic absorbances were measured as 0.105 and 0.201 for Ti and Co respectively. As a reference, a standard mixture containing 2.14 g Co/mL and 1.27 g Ti/mL was prepared as well as measured to have a signal-to-signal ratio of 2.53 Ti: 1.00 Co.
Find out the concentration moles/L of titanium in the original unknown solution
A 0.3000 g sample of carboxylic acid is burned in oxygen producing 0.5349 g of CO2 and 0.2202 g of H20. Find out the empirical formula of the carboxylic acid.
a 1.70-g sample of a large biomolecule was dissolved in 14.0 g of carbon tetrachloride. the boiling point of this
A 35.00 mL solution of 0.2500 M HF is titrated with a standardized 0.1356 M solution of NaOH at 25 C.
Tritium is radioactive, decaying by electron emission with a half-life of 12.5 years. What is the value of the decay rate constant for tritium in units of "per minute" or "minutes^-1"
If a reaction mixture contains only N2O and NO2 at partial pressures of 1.0 atm each, the reaction will be spontaneous until some NO forms in the mixture.
Consider the titration of 50.0 mL of 0.100 M HC3H5O2 by 0.100 M KOH for the following questions (Ka for HC3H5O2 = 1.3 x 10-5). Calculate all pH values to two decimal places.
An unknown volume of water at 18.2°C is added to 28.7 mL of water at 32.5°C. If the final temperature is 23.5°C, what was the unknown volume. (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL.)
A sample of ammonia, NH3, contains 3.3 x 1021 hydrogen atoms. How many nitrogen atoms are in this sample?
The reversible chemical reaction A+B C+D with an equilibrium constant of K 7.1.Initially, only A and B are present, each at 2.00 . What is the final concentration of once equilibrium is reached?
How much heat will be released if 1M and 100ml of NAOH solution reacted with 1M and 100ml of HCl solution
what is the resulting pH when mixing 200.0mL solution of 0.50 N HCl (strong acid) with 300.0mL solution of 0.45 M KOH (string base)
a student designs an ammeter a device that measures electricalcurrent that is based on the electrolysis of water into
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