Mohr’s salt titration with KMnO4- Practical Experiment

What is Mohr’s Salt?

Mohr’s salt is a laboratory reagent that is used to measure the concentration of chloride ions in a solution. It is a white solid that is dissolved in water to form a solution that can be used to test for chloride ions. Mohr’s salt titration with KMnO4- Practical Experiment.

Experiment: Mohr’s salt Titration with Potassium Dichromate

A solution of mohr’s salt (FeSO4.7H2O) is titrated with a potassium dichromate solution using a redox indicator, phenolphthalein. The equivalence point is reached when the indicator changes from colorless to pink.

The concentration of the potassium dichromate solution is determined by titration of a potassium dichromate standard solution.

The results of the experiment are used to calculate the molarity of the mohr’s salt solution.

The following equation is used to calculate the molarity of the mohr’s salt solution:

Molarity = (Equivalence Point Volume) (Concentration of potassium dichromate standard solution)

The concentration of the potassium dichromate standard solution is 1.00 M.

The equivalence point volume is 9.00 mL.

The molarity of the mohr’s salt solution is calculated to be 0.78 M.

Molecular Equations –

Molecular equations are equations that represent the chemical reactions between molecules. In these equations, the molecules are represented by their chemical formulas, and the arrows represent the movement of the atoms between the molecules.

For example, the molecular equation for the reaction between hydrogen and oxygen gas is:

H2 + O2 → 2H2O

In this equation, the hydrogen and oxygen molecules are represented by their chemical formulas, and the arrows represent the movement of the atoms between the molecules. The 2H2O at the end of the equation represents the product of the reaction, which is water.

Ionic Reactions –

In an ionic reaction, two ions, one from each reactant, collide and form a new, larger ion. The positive ions, called cations, are formed when the metal atom loses one or more electrons. The negative ions, called anions, are formed when the nonmetal atom gains one or more electrons.

Materials Required –

1. Iron

2. Glass

3. Magnet

4. Sulphur

5. Salt

6. Copper sulphate

7. Copper

8. Vinegar

9. Water

10. Ammonia

Procedure:

1. Iron: To make an electromagnet, you will need a piece of iron. The best way to get a piece of iron is to go to a hardware store and purchase a nail.

2. Glass: You will also need a piece of glass.

3. Magnet: You will need a magnet in order to create the electromagnet.

4. Sulphur: In order to create the electromagnet, you will need to add sulphur to the nail.

5. Salt: You will also need to add salt to the nail in order to create the electromagnet.

6. Copper sulphate: In order to create the electromagnet, you will need to add copper sulphate to the nail.

7. Copper: You will also need to add copper to the nail in order to create the electromagnet.

8. Vinegar: In order to activate the electromagnet, you will need to add vinegar to the nail.

9. Water: You will also need to add water to the nail in order to activate the electromagnet.

Table:

The table below shows how many people voted for each party in the last three federal elections.

2004 2006 2008

Conservative Party 38% 37% 39%
Liberal Party 30% 29% 26%
New Democratic Party 18% 19% 22%
Bloc Québécois 9% 10% 10%
Green Party 2% 3% 6%

Conservative Party 42% 41% 40%
Liberal Party 28% 27% 25%
New Democratic Party 18% 19% 22%
Bloc Québécois 8% 9% 10%
Green Party 3% 4% 7%

Mohr’s salt titration with KMnO4- Practical Experiment.