At 25 degrees celsius only .0640 mol of the generic salt AB2 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 degrees celsius. I got 1.0 X 10^-3 but the computer says its wrong. Plse help

Drug money extract in the 5.0 mL methanol containing cocaine gave a signal of 4.27 mV in a GC-FID experiment. Then 500 L of 20.0 ppm cocaine were added to the 5.0 mL methanolic extract. This spiked solution sample gave a signal of 7.98 mV. Find the concentration of cocaine in the original extract, in ppm, in mol/L, in g.

2.70 moles of an ideal gas with CV,m=5R/2are transformed from an initial state T = 660. Kand P = 1.65 bar bar to a final state T = 298 Kand P = 4.75 bar.

Calculate ΔU for this process.

Calculate ΔH for this process.

Calculate ΔS for this process.

Please show work

Which choice below will increase the pH of a 0.2 M H2S solution

A) Bubble through more H2S

b) addition of Na2S

c) Addition of MgCl2 to form a solid precipitate of MgS

d) Addition of NaCl

e) addition of HNO3

The wavelengths of absorption of chromophores in electronic spectra are often influenced by the solvent. For example, polar solvents stabilize the ground state of n --> π transitions (n is a non-bonding orbital that is carried over into the molecular orbital scheme) more than the excited state. On the other hand, for π to π* transitions, the excited state is more stabilized. Sketch diagrams to show the changes in energy levels involved in the electronic transition when a chromophore changes from a nonpolar to a polar solvent environment and predict the shift in wavelength in each case.

Calculate the pH of a 0.335 M solution of ethylenediamine (H2NCH2CH2NH2). The pKa values for the acidic form of ethylenediamine ( H3NCH2CH2NH3 ) are 6.848 (pKa1) and 9.928 (pKa2).

pH=

Calculate the concentration of each form of ethylenediamine in this solution at equilibrium.

[H₂NCH₂CH₂NH₂]=

[H₂NCH₂CH₂NH₃⁺]=

[H₃⁺NCH₂CH₂NH₃⁺]=

Use an energy-state diagram to explain the difference between fluorescence and phosphorescence

1. Compound A is three times more soluble in diethyl ether than in water, so its partition coefficient is K = 3, for partitioning of compound A between diethyl ether and water. For a sample of compound A dissolved in 50 mL of water, answer the following questions:

A.) Determine the fraction of A that remains in the water, FsubA, after one extraction with 200 mL of diethyl ether.

B.) Determine FsubA after two extractions, using 100 mL of diethyl ether in each of the extractions.

C.) Determine FsubA after four extractionsm using 50 mL of deithyl ether in each of the extractions.

What is the pH of a 0.1 M solution of Sodium Acetate? (Hint: the acetate ion is a conjugate base of acetic acid)

Imagine that a polluter starts dumping sodium chloride into Lake Charles at a rate of 1437.3 kg per day, that the background concentration of NaCl in the lake was 11.3 ppm, and that the residence time of NaCl in the lake is 3.5 years. After 5 years, the Environmental Protection Agency catches on and turns off this source of NaCl. What would be the maximum concentration of NaCl in the lake? Please give your answer in ppm. Lake Charles has a volume of 1.8*107 m3.

equal volumes of solutions of the given concentrations are mixed together. which of the resulting aqueous solutions makes a buffer?

Calculate the pH of a buffer solution prepared by dissolving 4.2 g of NaHCO3 and 5.3 g of Na2CO3 in 0.20 L of water. Will the pH change if the solution volume is increased by a factor of 10?

[13] Write the equilibrium mass balance expressions for the following equilibrium in terms of (a) KC and (b) KP.
4HCl(aq) + MnO2(s) ? Cl2(g) + 2H2O(l) + MnCl2(aq)

[14] At 700 K the rate constant for the reaction 2NO + O2 ? 2NO2 is 5.73

Malonic acid (FW = 104.06) is a diprotic acid of the form CH2(COOH)2, with pKa1 = 2.847
and pKa2 = 5.696. Assume all solutions are ideal.
(a) If 15.000 g of malonic acid is added to 100 mL of pure water, what will the pH of the
solution be?
(b) You add 18 mL of 5 M NaOH to the solution in part (a). What will the new pH be?
(c) You then add 5.000 g of sodium malonate (Na2CH2(COO), FW = 148.025). What will
the new pH be?