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October 05, 2025, 08:21:11 pm

Author Topic: detailed description experiment  (Read 508 times)  Share 

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bar0029

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detailed description experiment
« on: March 10, 2011, 07:17:12 pm »
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hey can anyone check over this experiment and tell me if it is okay..

the question is:
Write a detailed description of the experimental method in point form that could be understood by other year 12 chemistry students

..


1. grind a small amount of fertilliser with mortal and pestle.
weight about 9.30g (record actual mass) and add to 100mL beaker.

2. add 50 mL H2O to the 100 mL beaker and stir to dissolve as much of the fertilliser as possible.
filter into 250 mL volumetric flask using no. 4 grade filter paper, washing the residue several times with distilled water

3. add about 20 mL of 1M H2SO4 solution to the flask and add more water so that the total volume is about 250mL.

4. using a 20mL pipette, dispense aliquots of the solution into each three conical flasks.

5. rinse and fill the burette with standard potassium permanganate solution. record the concentration and the initial burette reading (read from the top of the meniscus).

6. titrate by adding drops of solution from burette. the end point will occur when the solution in the conical flask changes from colourless to a pink-purple colour. record the burette reading.
repeat for other two conical flasks.
« Last Edit: March 10, 2011, 08:02:23 pm by bar0029 »
99.05