Other Chemistry Answers

Metallocene are metals sandwiched by two cyclopentadienyl ions, (C5H5)–. A metallocene sample of unknown metal, MC5H5 (all 5 are subscripts) was burned in air. Products of combustion found to contain 46.08488% carbon dioxide, 9.42644% water vapour and the rest are metal (I) oxide. All products are in mass percent. The mass ratio of stoichiometric amount of oxygen to the burned metallocene is 1:1.295. What is the name of the metal in the metallocene sample? Prove by showing your complete solution.

A 25.00 mL sample of 0.379 M nitric acid (HNO3(aq)) is titrated with 12.00 mL of 0.573 M lithium hydroxide (LiOH(aq)). Determine the amount of [H+(aq)] remaining in the flask and pH of the solution after reaction

A 0.20 M solution of hydrofluoric acid (HF(aq)) has a pH of 3.96 at 25 oC. Calculate the Ka and Percent Ionization of hydrofluoric acid.

HF(aq) + H2O(l)F-(aq) + H3O+(aq)

What is the pH of a sodium hydroxide solution at 25 oC in which the hydroxide ion concentration is 0.0026 mol/L? Is the solution acidic or basic?

The pH of a sample of human blood was measured to be 7.41 at 25 oC. What is the hydroxide ion [OH-(aq)] concentration?

Because rain washes pollutants out of the air, many Ontario lakes are undergoing changes in pH. The water in one such lake was found to have a hydronium ion concentration of 3.2 x 10-5 M. What is the pH of this lake? Is it considered acidic or basic?

Identify the acid, its conjugate base, the base and its conjugate acid in the following reaction:

H3PO4(aq) + NH3(aq)H2PO4-(aq) + NH4+(aq)

Given the solubility of MgF2(s) is 8.4 x 10-7 M, calculate the value of Ksp for the reaction, MgF2(s)Mg2+(aq) + 2 F-(aq) at 275 oC.

Write the Solubility Product Constant (Ksp) expression for the following solution at 275 oC.

MgF2(s)Mg2+(aq) + 2 F-(aq)

The equilibrium constant for the reaction below is 0.18 at 25 oC.
PCl3(g) + Cl2(g)PCl5(g)

The following concentrations were measured from the reaction vessel: (4 marks)

[PCl3(g)] = 0.0420

[Cl2(g)] = 0.0240

[PCl5(g)] = 0.00500

Is this system in equilibrium? Explain.
If not, in which direction will the system shift?