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An extraction specifies than an aqueous solution which contains dissolved organic material be extracted twice with 10mL of diethyl ether. A student removed the lower layer after the first extraction and adds the second 10 mL portion of ether to the upper layer remaining in the separatory funnel. After shaking the funnel the student notices only one liquid phase with no interface. Explain.
What volume, in mL, of 0.1085 M H2SO4 would react exactly with 40.0 mL of a 0.995 M solution of KOH by the reaction: H2SO4 (aq) + 2 KOH (aq) -------> K2SO4 (aq) + 2H2O (l)
Calculate the amount of energy in kilojoules needed to change 117 of water ice at 10 to steam at 125 . The following constants may be useful.
what is the ph of a solution prepared by mixing 50.0ml of 0.125M KOH and 50.0 ml of 0.125M HCl
What type of bonding between amino acid residues is most important in holding a protein and polypeptide in a specific secondary configuration?
calculate the potential of a platinum electrode immersed in a solution that is prepared by mixing 25 ml of 0.0832 M V2(SO4)3
The butylammonium ion, C4H9NH3^(+), has a Ka of 2.3x10^(-11) C4H9NH3^(+) + H2O > H3O^(+) + C4H9NH2 A. Calculate Kb for the conjugate base, C4H9NH2 B. What is the pH of a 0.015M solution of butylammonium chloride
Calculate the molality of a hydrochloric acid solution that is 26.4% by mass and has a density of 1.19 g mL^-1
Standard reduction potentials are given on the next page. (a) Draw a diagram of the electrochemical cell, labeling all electrodes and solutions. (b) What is the pH in the Pt | H+ | H2 half-cell? (c) What is the value of the equilibrium constant fo..
Calculate the energy needed to convert 50.0 g methane (CH4) from a solid at --100.°C to a liquid at 25°C.
What mass of sodium phosphate would have to be added to 2.0 of this solution to completely eliminate the hard water ions? Assume complete reaction.
Draw an arrow pushing mechanism for the formation of the acylium ion when acetic anhydride reacts with phosphoric acid.
Water can be separated into hydrogen and oxygen gases by using electricity to break the bonds in a process called electrolysis. The reaction is:
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