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A 0.331-g sample of aspirin prepared in the laboratory was dissolved in 95% ethanol as well as titrated to a phenophthalein endpoint with 16.7ml of 0.107M NaOH.
a) Compute the moles of acetylsalicylic acid is present in the aspirin sample.
b) Explain what mass (g) of acetylsalicylic acid is present in the sample?
c) Compute the percent purity of the aspirin sample.
The bond in molecular iodine is quite weak, and hot iodine vapor contains a proportion of atoms. When 1.00 g of I2 is heated to 1000 K in a sealed container of volume 1.00 L
in a coffee-cup calorimeter 1.20 g of nh4no3 is mixed with 79.0 g of water at an initial temperature of 25.00degc.
Write the reaction of the borohydride ion with water using curvy arrows to show electron movement to form one molecule of H2. Draw a complete line structure for the borhydride ion.
Calculate the lime dosage required for soften- ing by selective calcium removal for the following water analysis. The dissolved solids in the water are CO2 = 17.6 mg/L, Ca2 + = 63 mg/L, Mg2 + = 15mg/L, Na + = 20mg/L, Alk (HCO3- )
If 1.50g (NH4)2SO4 is dissolved in enough water to form 250 ml of solution, what is the molarity of the solution.
Add charges, single electron dots, and/or pairs of dots as suitable to demonstrate the Lewis symbols for the steadiest ion of each element. Treat n=4 as the valence shell in all cases.
The O-H stretch of a concentrated solution of an alcohol occurs at a lower frequency than the O-H stretch of a dilute solution.
a metal m can readily form the m cation. a nonmetal x is a gas at room temperature and can easily form the x- anion.
at 400K and a total pressure of 1.0atm, the mole fraction of H2 is 0.25 and that of I2 is 0.30, in equilibrium with HI. Calculate Kp and Kc for the equilibrium.
Amino acids with an additional COOH group in the side chain are called acidic amino acids.
how many miles could you drive for 3.90 if the gas mileage of your car is 14.0 kmliter of gasoline and the price of
Show your calculations and determine the half-life of Tc-99 (in hours). (b)The delivery of a sample of Tc-99 from the reactor to the nuclear medicine lab of the hospital takes 3h.
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