Show your calculation for the preparation of 100 mL of a solution of approximately 4 mM (that is 4 x 10-3 M) o-nitrophenol (M.W. 139.11 g mol-1) using 0.40 M Na2CO3 as the solvent.

A solution is made by dissolving 0.455 g of PbBr2 in 100 g of H2O at 50C. Based on the data in Table 8-1, should this solution be characterized as a. saturated or unsaturated b. dilute or concentrated

You are given an 18% solution of sodium imidazole. What mass of imidazole (in g) would be in 20 mL of this solution?    a. You need to use the sodium imidazole stock solution from Q11 to make a dilute imidazole solution (final volume 180 mL) at      a final concentration of 0.2 M. The molecular weight of imidazole is 90 g/mole.    What volume of imidazole stock would you use (mL)?     b. You need to use the sodium imidazole stock solution from Q11 to make a dilute imidazole solution (final volume 180 mL) at a final concentration of 0.2 M. The molecular weight of imidazole is 90 g/mole.    What volume of water would you add (mL)?

A 3mL sample of 2-hexene is mixed with 5.0mL of 0.10 M KMnO4 solution. Predict what the resulting mixture will look like. Explain your prediction.