Preparing 0.005 M Solution of Mohr's Salt
To prepare a 0.005 M solution of Mohr's salt, we need to take the following steps:

- Determine the molar mass of Mohr's salt, which is Fe(NH4)2(SO4)2.6H2O. It is calculated as follows: Fe = 55.85 g/mol, N = 14.01 g/mol, H = 1.01 g/mol, S = 32.06 g/mol, O = 16.00 g/mol. Therefore, the molar mass of Mohr's salt is (55.85 + 2 x 14.01 + 2 x 32.06 + 6 x 18.02) g/mol = 392.14 g/mol.
- Calculate the amount of Mohr's salt needed to prepare 1 liter of 0.005 M solution. This can be done by using the formula: amount (in moles) = concentration (in moles/liter) x volume (in liters). Since we want to prepare 1 liter of 0.005 M solution, the amount of Mohr's salt needed is 0.005 moles.
- Weigh out the required amount of Mohr's salt and dissolve it in distilled water. Make up the volume to 1 liter using distilled water. The solution is now ready.

Molarity and Strength of KMNO4 Solution
To determine the molarity and strength of the given KMNO4 solution, we need to carry out a titration with a known solution of Mohr's salt. The steps involved are:

- Weigh out a known amount of Mohr's salt and dissolve it in distilled water. This solution is the known solution of Mohr's salt.
- Take a known volume of the KMNO4 solution in a conical flask and add a few drops of dilute H2SO4 to it. This step is done to convert any MnO4- ions present in the solution to Mn2+ ions.
- Titrate the KMNO4 solution with the known solution of Mohr's salt until the end point is reached. The end point is indicated by the disappearance of the pink color of the KMNO4 solution.
- Record the volume of Mohr's salt solution required to reach the end point. Let this volume be V ml.
- Calculate the molarity of the KMNO4 solution using the formula: Molarity = (amount of Mohr's salt in moles x 5) / V, where 5 is the factor obtained from the balanced chemical equation for the reaction between Mohr's salt and KMNO4.
- Calculate the strength of the KMNO4 solution as the percentage by weight of KMNO4 in the solution. This can be calculated using the formula: strength = (mass of KMNO4 in grams / volume of solution in ml) x 100%.

Note: The above steps assume that the purity of the Mohr's salt and KMNO4 is 100%. If the purity is less, the calculated molarity and strength will be lower than the actual values.