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What mass of sodium fluoride must be added to 250. mL of a 0.100 M HF solution to give a buffer solution having a pH of 3.50? (Ka(HF) = 7.1 ´ 10-4)
A student dissolves 1.01 grams of nicotinic acid, C_6_H_5_NO_2_, in water to give 60 mL of solution having a pH of 2.67. What is the approximate value of Ka for the acid based on this observation?
Gas stoichiometry and Percentage of calcium carbonate in the sample
what is the partial pressure of nitrogen in a container that contains 3.96mol of oxygen
One mole of carbon-12 atoms is equal to a mass of exactly how many grams of carbon-12 atoms?
What is the BOD concentration just downstream of the discharge point? (b) If the stream has a cross-sectional area of 10 m2, "what is the BOD concentration 50 km downstream? (BOD is removed with a first-order decay rate con- stant equal to 0.20/da..
Calculate the number of molecules of AsCl3 that would be in 1 mL of Solution C at this concentration. Look at your answer. This is the average number per mL. But what is the most likely number (ie integer) of molecules of AsCl3 in 1 mL?
Explain the steriochemisty of gyceraldehyde and glycerol, give reasons for absence of anomeric forms in sucrose
Using K=3.9 as the equilibrium constant, Keq, Compute the amount of Isoamyl acetate, also known as isopentyl acetate (C7H14O2 )that must be present at equilibrium.
The electron in the n = 5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?
The simplest formula of a substance is found to be CH2O, and its approximate molar mass is found by experiment to be 93 g•mol-1. What is its exact molar mass?
How many milliliters of .200 m NaOH are needed to neutralize 100.ml of .100 m HCl
the presence of other metal ions from the dissolved brass interfere with the determination of copper in this experiment?
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