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1) Given aqueous solutions of 0.1 M weak acetic acid (CH3COOH , pKa = 4.72) and 0.1 M so- dium acetate ( NaC2 H3O2 ), calculate the volumes of acid and acetate to be mixed, in order to make 50 mL of a buffer solution with a pH = 5.2.
2) Given 0.1-M aqueous solutions of ammonium chloride (NH4Cl) and ammonia (NH3) to the so- lution of that weak base. Calculate the volumes of salt and ammonia to be mixed, in order to make 50 mL of a buffer solution with pH = 9.0. The ammonium ion (NH4+) has a dissociation constant of value Ka = 5.62.10^-10
Why might this fire rekindle days later as someone tries to remove the residue with water? What chemical process is involved here?
a particular balloon is designed by its manufacturer to be inflated to a volume of no more than 2.5 l. if the balloon
At a certain temperature, the equilibrium constant for the following chemical equation is 3.30. At this temperature, calculate the number of moles of NO2(g) that must be added to 2.86 mol of SO2(g) in order to form 1.30 mol of SO3(g) at equil..
2KMnO4 + 10KI + 8H2SO4 ---> 6K2SO4 + 2MnSO4 + 5I2 + 8H20. How many moles of I2 are produced by reacting 28.0 g KMnO4, 18.0 g KI, and 46.0 g H2SO4
what weight of pure h2so4 is present in each liter of concentrated sulfuric acid whose density is 1.86 gml and which
What would the maximum input (influent) concentration be for a CSTR reactor operating at steady state that degrades the toxic chemical DDB if the treated effluent concentration must not exceed 5 µg/L?
Calculate the vapor pressure of water above a solution prepared by dissolving 37.0 of glycerin () in 135 of water at 343 . (The vapor pressure of water at 343 is 233.7 .)
Explain why titanium is a good choice of material for golf clubs. When not in use, discuss at least one precaution to observe when storing clubs?.
Consider three different compounds of the hypothetical element X using the table of bond lenghts as a reference, rank the three compounds shown below in order of increasing
1FeO3+2 Al= 1Al2O3+2Fe, Determine the percent yield of a reaction that produces 28.65g of Fe when 50.0g of Fe2O3 reacts with excess Al according to the following reaction. Be sure to balance the reaction.
How many kilograms of methane (CH4) are in perfectly insulated piston with the following properties: Volume = 2 cubic meters.
how many moles of N atoms are there in .882 moles of (NH2)2CO?
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