In an experiment, an acidic compound is separated from the contaminant (either a basic or neutral compound) using liquid-liquid extraction.
List of organic extraction solvents available:
- Dichloromethane
- Diethyl ether
- Ethanol
- Ethyl acetate
- Hexanes
- Methanol
- 3 M HCl
- 3 M NaOH
What will be your approach to determining the best extraction solvent to use in this experiment from the possible organic solvents listed?
In: Chemistry
IV) Many enzymes obey simple Michaelis-Menten kinetics, which
are summarized
by the equation:
rate = (V max [S])/([S]+K m ); where V max = maximum velocity, [S]
= concentration
of substrate; and K m = the Michaelis constant.
It is instructive to plug in a few values of [S] into the equation
to see how rate is
affected. What are the rates for [S] equal to zero, equal to K m ,
and equal to infinite
concentration? Show all work.
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In a bromine-producing plant, how many liters of gaseous elemental bromine at 277?C and 0.935 atm are formed by the reaction of 450. g of sodium bromide and 205 g of sodium bromate in aqueous acid solution? (Assume no Br2 dissolves ad that sulfuric acid is present in large excess.)
5NaBe+NaBrO3+3H2SO4 -> 3 Br2+3Na2SO4+3H2O
In: Chemistry
Calculate the pH of the solution that results from each of the following mixtures.
55.0 mL of 0.16 M HCHO2 with 75.0 mL of 0.13 M NaCHO2
125.0 mL of 0.11 M NH3 with 250.0 mL of 0.11 M NH4Cl
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C6H14(l) + Br2(l) + light → C6H13Br(l) + HBr(g) How do I explain this reaction?
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Phosphorus pentachloride decomposes according to the chemical equation PCL5(g)<--->PCl3(g)+Cl2(g). Kc=1.80 at 250 C. A 0.220 mol sample of PCl5(g) is injected into an empty 3.00 L reaction vessel held at 250 �C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.
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23.balance Al2O3(s)+NaOH(i)+Hf(g)--> Na3AlF6+H2O(g)
a. If 11.1 kilograms of Al2O3(s), 59.4 kilograms of NaOH(l), and 59.4 kilograms of HF(g) react completely, how b. many kilograms of cryolite will be produced?
c. Which reactants will be in excess?
What is the total mass of the excess reactants left over after the reaction is complete?
In: Chemistry
A. You mix a 125.5 mL sample of a solution that is 0.0111 M in NiCl2 with a 183.0 mL sample of a solution that is 0.225 M in NH3
After the solution reaches equilibrium, what concentration of Ni2+(aq) remains? (Formation constant is Kf=2.0×108.)Express your answer with the appropriate units.
B. A 120.0 −mL sample of a solution that is 2.7×10−3 M in AgNO3 is mixed with a 230.0 −mL sample of a solution that is 0.10 M in NaCN.
After the solution reaches equilibrium, what concentration of Ag+(aq) remains?
Express your answer using two significant figures.
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Classify each statement about effective nuclear charge, Zeff, as true or false.
-Effective nuclear charge increases from left to right across a period on the periodic table
-Across a period, as Zeff increases, atomic size increases
-in a N atom, a 1s electron has a great Zeff than a 2s electron
-Effective nuclear charge does not depend on the number of electrons present in an atom
-Electrons in a s orbital are more effective than those in other
orbitals at shielding other electrons from the nuclear charge
-a 1s electron in a B atom has a smaller Zeff than a 1s electron in
a Be atom
In: Chemistry
A beaker with 125 mL of an acetic acid buffer with a pH of 5.00 is sitting on a bench top. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.90 mL of a 0.350 MM HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.
In: Chemistry
In: Chemistry
A 0.4672 g sample of pewter (containing tin, lead, copper, and zinc) was dissolved in acid. The precipitate SnO2
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What is the relationship between the percent of oxygen in a fuel and the amount of energy avaliable per mole of fuel?
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Given the following thermodynamic reactions: CaO (s) + Cl2 (g) ---> CaOCl2 delta H° = -110.9 KJ/ H20 (l) + CaOCl2 (s) + NaBr (s) ---> 2NaCl (s) + Ca(OH)2 (s) + Br2 (l) delta H° = -60.2 KJ/ Ca(OH)2 (s) ---> CaO (s) + H2O (l) delta H° = +65.1 KJ. Calculate the value of delta(Δ)H° (in kilojoules) for the reaction 1/2 Cl2 (g) + NaBr (s) ---> NaCl (s) +1/2 Br2 (l)
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