task 2,4 week 3th.pptx
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The document provides procedures for preparing 3 solutions - 0.1M HCl, 10% KNO3, and 0.2M NaOH - listing the concentration, solvent, source, and purpose of each. It also describes how to calibrate a 25ml volumetric flask by weighing it empty and full of water 5 times to determine the real volume, and how to calibrate a 1ml pipette by weighing 1ml aliquots of water dropped in and calculating the average volume.
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task 2,4 week 3th.pptx
- 1. Task 4. Writing the procedure Write the procedure for preparing following solutions: Solution of Concentration Solvent Source Purpose HCl 0.1 M 100.00 ml water Concentrated HCl water solution As a titrant for acid-base titration KNO3 10% 200 ml water KNO3 lab.grade As ionic species (for increasing conductivity of solutions) NaOH 0.2 M ethanol NaOH 99.99% Ethanol (anhydrous, 99.0%) For organic synthesis What is necessary: Equipment; Glassware; Primary solutions? Any requirements for them?
- 3. Preparation Procedure: HCl Take a 100ml volumetric flask, drop some distilled water about 80ml, then drop 8.28ml of concentrated HCl solution, and then drop some more distilled water into the flask till the volume of the solution reach the 100ml line in the flask, shake it 5 times and your solution is ready. Preparation Procedure: KNO3 Take a 200ml volumetric flask, drop some distilled water about 150ml, then drop 44.764g of Lab. Grade Potassium nitrate, shake it to dissolve the salt into distilled water, and then drop some more distilled water into the flask till the volume of the solution reach the 200ml line in the flask, shake it 5 times and your solution is ready. Preparation Procedure: NaOH The volumetric amount of solution to be made is not known.
- 4. Task 2. Calibration of volumetric labware Prepare the detailed procedure how to calibrate the following volumetric dishes: 25-ml volumetric flask or 5-ml Mohr pipette; And 1-ml pipette-dosator.
- 5. 25ml Volumetric flask 1. First, we should be sure that the flask is clean and empty of any substance. 2. Find the weight of the volumetric flask and to be noted. 3. Should get the distilled water in 4oC. 4. Take 25ml distilled water by a pipette and put it into flask. 5. Find the weight of the water containing flask. 6. Find the weight of the water (difference of the two states of flask). 7. Calculate the volume of the dropped water. 8. Repeat these processes for 5 times and then see volume result. 9. You can find that the real volume of the flask.
- 6. 1ml pipette-dosator 1. Do the calibration processes as the volumetric flask but a little different 2. Take a flask or any other thing on the analytical wight balance. 3. Take 1ml of distilled 4oC water by pipette-dosator and drop the water to the flask. 4. Find the water’s wight. 5. Do this process 5 times, and then you can find the real volume of the pipette-dosator.
- 7. Hand write: