nSiueratshs: Wear your safety glasses. 3M H2SO4 is quite corrosive. Handle with
ID: 1055230 • Letter: N
Question
nSiueratshs: Wear your safety glasses. 3M H2SO4 is quite corrosive. Handle with care, and immediately wash off, for at least 5 minutes, any that comes in contact with your skin. work in teams of two for this experiment, but you will work individually on the practical. Diluting the KMn04 stock solution 31.S Step 1: A stock solution of concentrated KMnO4 is available on the lab bench. Its approximate concentration is written on its label. From this stock solution, prepare 250 mL of approximate 0.020 M KMn04 solution. Clearly show your calculations in the Step 1 Calculation area of the report sheet. (Because this solution concentration is approximate, you may use a graduated cylinder and beaker to prepare it.) Transfer the solution to your 500 mL plastic bottle and cap it. This diluted solution (NOT the stock solution that you used to make it) should be standardized and used to titrate the unknown on the same day. If you need to use it the second day, you must run a known to check its concentration. If the result is appreciably different than the first day's result, you must re-standardize. Step 2: Rinse a clean buret with three 5 mL portions of your diluted KMnO, solution t v4nO, IIse nroner technique in prepa
Explanation / Answer
You have been provided kmno4 stock solution. It's concentration is being labelled on the bottle. Let the concentration of stock solution of kmno4 be M1 (in terms of molarity).
Given that you need to prepare 250 ml of 0.020M kmno4 solution.
We have a formula M1V1= M2V2
Here M1= molarity of stock solution of kmno4 mentioned on the bottle
V1= volume of stock solution of kmo4 required
M2= molarity of the solution to be prepared= 0.020M
V2= volume of 0.020M solution to be prepared.= 250ml
By using M1,M2,V2, the volume of stock solution required for dilution is calculated using the above mentioned formula.
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