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Explain why sodium hydroxide cannot be used as a primary or secondary standard - i.e. why the molarity of a sodium hydroxide solution cannot be determined by simply weighing out a sample of solid NaOH, dissolving it in a known amount of water, and calculating its molarity based on the molar mass of MaOH and the overall volume of solution.
briefly explain how you will isolate p-tert-butylphenol after you have extracted it into NaOH solution.
what is the difference of the KBR specrtum in % transmittance and absorbance. and btw wavenumber and wavelength
For the oxidation-reduction reaction equation given here, 2Na + S --> Na2S, indicate how many electrons are transferred in the formation of one formula unit of product.
Calculate the work (in kJ) when 1.70 moles of hydrogen gas are produced from the reaction of sodium in excess water at 298 K
If the imaging agent had an initial rate of 7500 decays per minute (dpm) and if the imagine required 1 hour to complete, what would the decay rate be immediately after the test is completed?
If aqueous solutions of Na2SO4 and BaCl2 are mixed, a white precipitate forms. What is the identity of the precipitate
The equilibrium constant (KP) is 0.13 at a particular temperature for the reaction: N2O4(g) ? 2NO2(g) Given the following sets of initial conditions, what is the net change that must occur for the reaction to reach equilibrium
The mercury in a .8142g sample was precipitated with excess of H5IO6. The precipitate was filtered and washed free of the precipitating agent, and .4114g was recovered. Calculate the % of Hg2Cl2 in the sample
Cocaine overdose and addiction are major public health problems. One novel treatment involves the administration of high activity mutants of human butyrylcholinesterase (BChE) (i.e. this would be a protein-based ‘drug') that would hydrolyze and d..
How many moles of CO2 will be produced if 3.119 g of O2 are reacted completely?
A 155-g piece of copper at 159oC is dropped into 250.0 g of water at 18.7oC. (The specific heat of copper is 0.385 J/goC.) Calculate the final temperature of the mixture.
A student determined the Ca^2+ ion content of a 100 mL sample of calcium-fortified orange juice. After adding 2.0 M HCl solution to the sample, the student filtered the juice to remove the pulp and other particulate matter.
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