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At a pH of 4, the Cu-neocuproine complex formed in the liquid-liquid extraction experiment has a partition coefficient of about 6.3 when equilibrated between the acid aqueous solution and chloroform. Calculate the concentration of Cu in the chloroform phase if 30 mL of a 0.28 M aqueous Cu solution buffered to pH 4 is equilibrated with 22 mL of chloroform.
A 0.2527-g sample of a mixture of Mg(OH)2 and Al(OH)3 was treated with 50.00 mL of 0.225 mol L^-1 HCl(aq). The resulting solution required 13.73 mL of 0.176 mol L^-1 NaOH(aq) to neutralize the excess, unreacted HCl. What was the percentage by mass..
Ammonia gas and hydrochloric acid vapor undergo a reaction to produce solid ammonium chloride. The reaction equation is given below together with relevant thermodynamic data at 298K
The equation for the reaction is CaCO3(s) + 2HCl(aq) arrow CaCl2(aq) +H2O(l) +CO2(g) The excess HCL (aq) is titrated by 6.45 mL of 0.125 M NaOH(aq). Calculate the mass percentaageof CaCO3(s) in the sample.
When the following deuterium-labled isomer undergoes elimination, the reaction yields only trans-2-butene and cis-2-butene-2-d.
A hypothetical compound has a formula X4YZ5. if the atomic masses of X, Y, and Z are 165.3amu, 75.5amu and 37.2 amu. Calculate the % composition by mass of the compound
Strontium-90 is a byproduct in nuclear reactors fueled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 yr. What percentage of a strontium-90 sample remains after 75.0 yr
The Ksp for silver sulfate (Ag2SO4) is 1.2 multiplied by 10-5. Calculate the solubility of silver sulfate in each of the following.
A mole is equal to 6.02 x 10^23. 10 moles of hydrogen atoms are placed in a container. The hydrogen atoms are removed and counted one by one. What will the final count of hydrogen atoms be
Titration of 80 ml of unknown concentration of H3PO4 requires 126ml of 0.128M KOH. What is the concentration of H3PO4?
What are the degeneracy of the first six levels for an electron in a cubicul (3-dimensional) box with box length, L = L(x) = L(y) = L(z) = 1.00pm
A voltaic cell consists of a strip of lead metal in a solution of Pb(NO3)2 in one beaker, and in the other beaker a platinum electrode immersed in an NaCl solution, with Cl2 gas bubbled around the electrode. The two beakers are connected with a sa..
why does one begin a column elution with non polar solvents and progress to more and more polar solvents
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