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Explain what affect will contamination of aspirin by a small amount of caffeine, acetaminophan as well as water have on the melting point of aspirin?
The molar volume of a certain form of solid lead is 18 cm^3/mol. Assuming cubic closest packed structure, determine the following:
Calculate the standard cell potential at 25 degrees celsius for the reaction X(s)+2Y+(aq) -> X^2+(aq)+2Y(s) where delta H = -733 kJ and delta S = -279 J/K
Which of the following compounds does NOT have an alkyll group covalently bonded to the C of the carbonyl group
We place the 2.00M HCl into the buret tube. Next we place 30.0 mL of the KOH unknown Molarity solution into a small flask and add some phenolphthalein indicator turning the solution an intense pink color. When we titrate exactly 32.0 mL of the 2.0..
Briefly explain which indicator, bromocresol purple (pKa = 6.3; from yellow to purple) or thymolphthalein (pKa= 10.0; from colourless to blue), would be better for use in this titration
What is the H3O+ concentration of the solution?
Calculate the mass (g) of CdC2O4 that will dissolve in 2000 mL of 0.357 M CdBr2 solution. The equation represents the solubility process.
Strontium-90 is present in the fallout produced by nuclear weapons testing in the atmosphere. Sr-90 is potentially dangerous to humans and animals because it substitutes chemically for calcium in bones and has a half-life of almost 29 years.
Calculate OH- of each aqueous solution using the following H3o+ A baking soda 1.0 X 10-8M B orange juice 2.0 X 10-4
A gas mixture has three components: N2, F2, and He. their partial pressure are 0.60atm, 0.16atm, and 0.18 atm , respectively. What is the pressure of the gas mixture
Explain how many half-lives must elapse before the activity of a radioactive isotope reduce to 1% of its initial value? Explain how long is this time for 87Rb, which has a decay constant of 0.1420 x10-10/yr?
The acid dissociation constants of sulfurous acid ( H2SO3) are K a1= 1.7 x10^-2 and K a2= 6.4 x10^-8 at 25.0 degrees C. Calculate the pH of a 0.163 M aqueous solution of solution of sulfurous acid.
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