Finely ground nickel (II) hydroxide is placed in a beaker of water. It sinks to the bottom of the beaker and remains unchanged. An aqueous solution of hydrochloric acid is then added to the beaker and the Ni(OH)2 disappears. Which reaction best describes what occurred in the beaker? Your

Ni(OH)2 (s) + HCl (aq) → NiO (aq) + H2 (g) + HCl (aq)

Ni(OH)2 (s) + 2 HCl (aq) → NiCl2 (aq) + 2 H2O (l)

Ni(OH)2 (s) + 2 H2O (l) → NiCl2 (aq) + 2 H2O (l)

Ni(OH)2 (s) + 2 H2O (l) → NiCl2 (aq) + 3 H2O (l) + O2 (g)

According to the tide table below what time of day will the highest tide occur?

What is the value of keq for the reaction expressed in scientific notation

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml