Inorganic Chemistry Answers

The gas L has exactly the same    properties as the product obtained when carbon is burned in an excess of oxygen

Write a balance molecular equation for the reaction between KMnO4 and KI in Basic Solution. The skeleton ionic reaction is MnO-4(aq)-> MnO2/4 (aq)+ IO-3 (aq). Show your solution.

Draw the procedure.

1.Tear off the outer cardboard covering and remove the metal plate at the top of the dry cell. Carefully draw out the carbon rod with its attached brass cap using a pair of pliers. Remove the pitch at the top. Scrape the mixture of manganese dioxide and ammonium chloride into the beaker. Clean the zinc casing by washing with hot water. Dry and cut it into small pieces. Keep the pieces of zinc in a stoppered and labeled bottle for future use. Save the carbon rods.

When 10.0 grams of A was heated, 4.40 grams of B was given off, leaving 5.60 grams of E. The same quantity of B can also be prepared by combination of 1.2 grams of C and 3.2 grams of D. C decomposes to form a new substance while D was found to contain two chemical elements. The E can be electrolyzed after melting to yield 4.0 grams of F and 1.6 grams of G, neither of which can be further decomposed by ordinary chemical means. E combines with water to give 1.3 grams of J per gram of E and gas L. The gas L has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen.

1.              Using a diagram, show how the components of a discarded dry cell can be recycled based on the procedure given.

2.              What are the separation techniques used in this experiment, draw the set up and explain the principle behind each technique.

3.              Draw your conclusion.

Cross section of a battery

When 10.0 grams of A was heated, 4.40 grams of B was given off, leaving 5.60 grams of E.   The same quantity of B can also be prepared by combination of 1.2 grams of C and 3.2 grams of D.  C decomposes to form a new substance while D was found to contain two chemical     elements. The E can be electrolyzed  after melting  to yield 4.0 grams of F and 1.6 grams of G,   neither  of which can be further decomposed by ordinary chemical means.  E combines  with water to give 1.3 grams of J per gram of E and gas L. The gas L has exactly the same    properties as the product obtained when carbon is burned in an excess of oxygen.

Identify each lettered material as element, compound and mixture.

3NaHCO3(aq)

    Four litres of 0.4M 3-(N-morpholino) propane sulfonic acid (MOPS) buffer of pH 7.5 are required. Available in the laboratory are 10M HCl and 10M NaOH and the zwitterionic form of MOPS (M.Wt = 210.3). The pKa for the MOPS zwitter ion is 7.2. Describe, showing the relevant calculations, the procedure for preparing the buffer