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In a titration of 50.0mL of 0.1000 M formic acid with 0.100 M KOH, the titration error must be no more than 0.05mL. What indicator can be chosen to realize this goal?
A flask contains 0.190 mol of liquid bromine, rm Br_2. Determine the number of bromine molecules present in the flask.
The formation constant Kf for the complex ion Zn(OH)42- is 2.8 1015. What is the concentration of zinc ion, Zn2+, in a solution that is initially 0.50 M in Zn(OH)42-
A mixture of gases containing 21.0 g of N2, 106.5 g of Cl2, and 12.0 g of He at 14 oC is in a 50.0 L container. What is the partial pressure of N2.
A sample of an unknowk gas effuses in 11.6 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. what is the molar mass of the unkown gas
Saturated acetone vapor enters a heat exchanger at a rate of 8.40 L/s and 1 atm, and emerges from the heat exchanger as a saturated liquid at the same pressure. Water at 1 atm enters the heat exchanger at 10.5 C and at a rate of 9.48 mol/s
You have a sample of a white crystalline substance from your kitchen. You know that it is either salt or sugar. Although you could decide by taste, suggest another property that you could use to decide.
Ozonolysis of C followed by treatment with Zn and water gives CH3CHO and compound D (C9H10O). The proton NMR spectrum of compound D is given below. Treatment of compound D with ethyl magnesium bromide yields A. Draw the structures of compounds A, ..
Cyclohexanol produces cyclohexene when heated to 70C in the presence of a sulfuric acid catalyst. Write the equation of the reaction.
How do I make a 125 mL acetate buffer with a pH of 4.6 by mixing 0.2 M acetic acid and 0.2 M sodium acetate in the correct proportions
What pressure of O2 would be required to have a solution of 1.5X10^-3g of O2 in 250g of H2O at 298K?
If 56.4 mL of BaCl2 solution is needed to precipitate all the sulfate ion in a 748 mg sample of Na2SO4, what is the molarity of the solution?
a sample of 4.0 mole O2 is originally confined to 20 L at 270 K and then undergoes adiabatic expansion against a constant pressure of 600 torr until the volume has tripled. calculate q, w, delta T, delta U and delta H
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