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The soda ash in your analysis was assumed to be pure Na2CO3. If some of the Na2Co3 is replaced by an equal number of formula weights of NaHCO3, how would the volume of acid change from
(a) The starting point to the phenolphthalein end point?
(b) The phenolphthalein end point to the bromocresol green end point?
(c) The starting point to the bromocresol green end point?
A radioactive sample contains 1.30g of an isotope with a half-life of 3.5 days. What mass of the isotope will remain after 5.6 days? (Assume no excretion of the nuclide from the body.)
freezing point ofnbsp pure 2-methyl-2propanol is noted 25.50c however it absorbs h2o as an impurity on exposure to
Calculate the pH of a solution prepared by mixing 20.0 mL of 0.01 M HCl with 100.0 mL of 0.10 M HCN. For HCN, Ka = 1.0 x 10- 10. Assume that the volumes are additive.
For a true polyene there may be a small potential energy change on the ends that can be approximated by v = k(x-a/4)^2 where k is some constant. Apply this perturbation to the ground state particle in a box and determine its energy. You will have ..
When 1 ml of HNO3 is added to the original solution what are the concentrations of [Ag+] and [Cl-]? I thought that the concentrations would decrease in the latter question, since there is twice as much solution. But shouldn't Q = Ksp, and the equi..
a gas sample containing 1.45 mol at 25degc exerts a pressure of 397 torr. some gas is added to the same container and
Caffeine crystals always contain at least one molecule of water per caffeine molecule. Draw chemical structures to explain why a water molecule might be essential to producing a stable crystal of caffeine.
A pentapeptide was found to contain the amino acids Phe, Gly, Met, Ala, and Ser. N-Terminal analysis yielded the PTH derivative of alanine. Partial hydrolysis of the pentapeptide yielded the dipeptides Gly-Ser, Ala-Gly, and Ser-Met. The peptide se..
Consider the following reaction at equilibrium. What effect will increasing the volume of the reaction mixture have on the system
Explain would the calculated molarity of NaOH be too high or too low If the KHP weighed in your experiment today was contaminated with some unknown inert substance.
At 25C, the vapor pressure of diethyl ether is higher than the vapor pressure of its isomer n-butanol. Why?
A gas measures 180. ml. at 870C and 800. mm Hg. Find its volume at standard temperature and 800 mm Hg of pressure.
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