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A solution contains one or more of the following ions: (Hg2)2+, (Ba)2+ and (Fe)2+. When potassium chloride is added to the solution, a precipitate forms. The precipitate is filtered off and potassium sulfate is added to the remaining solution, producing no precipitate. When potassium carbonate is added to the remaining solution, a precipitate occurs. Which ions were present in the original solution? Write net ionic equations for the formation of each of the precipitates observed.
A 9.0×10-2 M solution of a monoprotic acid has a percent dissociation of 0.60%. Determine the acid ionization constant Ka for the acid.
If a 0.10 M solution of an acid has a pH of 4.5, what would be the predicted pH of a 0.10 M solution of the conjugate and why
Several oxidation reductions take place. List three examples of oxidation reduction reactions that are involved. Show what is oxidized what is reduced, and indicate which enzyme (E1, E2, E3) is involved.
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.
Describe how you would prepare 500mL of a single solution containing 250mM Tris, 50mM glucose, and 5mM NaCl.
Fully explain two disadvantages of the colorimetric method to determine the concentration of species over te classial titration method. using two chemichal reactions explain how iodate ions and ypochlorite ions both act as oxidizing agents
What was the volume of the gas when the temp was changed to 50.0C and the new pressure was 760.0 torr.
How many grams of methanol must be added to 7.50 kg of water to lower its freezing point to -13.0 degrees C? For each mole of solute, the freezing point of 1 kg of water is lowered 1.86 degrees Celsius.
Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel.
1. what mass of phosphorous trichloride forms when 125g of P4(S) reacts with 323g of chlorine gas?
A sample of sodium reacts completely with 0.142 of chlorine, forming 234 of sodium chloride. What mass of sodium reacted?
When heated, the DNA double helix separates into two random-coil single strands. When cooled, the random coils form the double helix
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