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Once you have measured out your sample and transferred it to your flask, the absolute amount (moles) of sample is fixed. Adding water to the flask will change the concentration in the flask, titrating also adds volume to the flask as well as reacting with the sample. However, the number of molecules of sample you put into the flask will not change by simply diluting it with water.
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What is the titration flask?
It is the conical flask in which the solution from the burette flows into and which you add the indicator into.
Why does it not matter how much water you add when dissolving the acid (KHP) or when carrying out the titration?
Because water is not involved in the chemical reaction.
How do you prepare 0.1 N solution HCL from 1N?
Add 100 mL of HCl 1 N in a 1 L volumetric flask, class A or B; add ca. 850 mL distilled water to the flask. Place the flask in a thermostat at 20 0C. After 30 min add slowly distilled water to the mark (1 L) and stir well the closed flask. Pour the solution in a bottle. Place a label with the date, concentration, name of the solution on the bottle.
What is a good practice to follow in a titration?
Wash your beakers containg the 2 solns with water n rinse with the respective solns. Do the same 4 the burette n pipette. The titratn flask is 2 b washd only with water n NOT with any othr soln. Ensure that u add ur indicator in the titratn flask n not da soln beakrs. Take a pilot reading 1st. Whn u r ready 2 do da expt, add the soln 4rm the burette till ur pilot readng, then add dropwise till colour change persists.
Why do you swirl the Erlenmeyer flask?
To mix the reactants. Assuming you have been doing a titration experiment and I am doing your homework its so as you add the acid/alkali you can accuratly close the biuret when the indicator changes colour.
What is the titration flask?
It is the conical flask in which the solution from the burette flows into and which you add the indicator into.
Why is the conical flask only rinsed with distilled water in the titration procedure?
Yes. By adding water to rinse, you will be changing the concentration of the thing you are titrating, and so your calculation will be off. If you have material on the walls of the flask, just gently stir the flask and let the solution in the flask wash anything off the walls. I do not believe this is true. Once you add an amount of reactant into your flask adding more water will not change the number of moles of reactant that are present in the flask. The titrant will react in the mole ratio for that particular reaction so water doesn't play a role. You can rinse the flask and even use water to get part of a drop into your flask for a more accurate titration.
Why does it not matter how much water you add when dissolving the acid (KHP) or when carrying out the titration?
Because water is not involved in the chemical reaction.
Why were you instructed to keep swirling the flask?
To mix the reactants. Assuming you have been doing a titration experiment and I am doing your homework its so as you add the acid/alkali you can accuratly close the biuret when the indicator changes colour.
How do you prepare 0.1 N solution HCL from 1N?
Add 100 mL of HCl 1 N in a 1 L volumetric flask, class A or B; add ca. 850 mL distilled water to the flask. Place the flask in a thermostat at 20 0C. After 30 min add slowly distilled water to the mark (1 L) and stir well the closed flask. Pour the solution in a bottle. Place a label with the date, concentration, name of the solution on the bottle.
What is the procedure for determining the percentage purity of amino acid sample by sorenson formol titration method?
prepare about 1 to 1.5% solution of amino acid in 100 ml volumetric flask take 10 ml of the sample (amino acid) solution into 250 ml conical flask add phenophtalien indicator and titrate it against 0.1N standard NaOH when pink color appear stop the titration and add formalin untill the pink color disappear again titarte it with standard NaOH till the pink color reappear.
Why do you swirl the Erlenmeyer flask?
To mix the reactants. Assuming you have been doing a titration experiment and I am doing your homework its so as you add the acid/alkali you can accuratly close the biuret when the indicator changes colour.
What is a good practice to follow in a titration?
Wash your beakers containg the 2 solns with water n rinse with the respective solns. Do the same 4 the burette n pipette. The titratn flask is 2 b washd only with water n NOT with any othr soln. Ensure that u add ur indicator in the titratn flask n not da soln beakrs. Take a pilot reading 1st. Whn u r ready 2 do da expt, add the soln 4rm the burette till ur pilot readng, then add dropwise till colour change persists.
What happen if you adding water to the titrated substance in the conical flask during the process of titration?
NoUser 1Yes. By adding water to rinse, you will be changing the concentration of the thing you are titrating, and so your calculation will be off. If you have material on the walls of the flask, just gently stir the flask and let the solution in the flask wash anything off the walls.User 2I do not believe this is true. Once you add an amount of reactant into your flask adding more water will not change the number of moles of reactant that are present in the flask. The titrant will react in the mole ratio for that particular reaction so water doesn't play a role. You can rinse the flask and even use water to get part of a drop into your flask for a more accurate titration.User 3No. User 1 means to say that water in the volumetric burette or pipette will effect the concentration of titrant moles. Water in a conical flask will not effect the titre values because the same mole ratios are reacting, and your titre value is measured from the volume remaining in the volumetric burette and not the conical flask. User 2 is correct, although using water to rinse the volumetric burette's contents into the conical flask would adversely effect the results, as volumetric burettes and pipettes are designed to account for the few remaining drops in the instruments. Shaking or tapping the instruments is also a bad idea, as they can easily be broken and doing this would effect your titre values anyway.User 4It will not affect the result at all as long as you use distilled water, as just tap water obviously contains other minerals etc that will affect the results.
1.5N NAOH solution preparation?
1. Weigh 60 g NaOH. 2. Put this NaOH in a 1 L volumetric flask. 3. Add slowly 200 mL distilled water and stir. 4. Put the flask in a thermostat at 20 0C and maintain for 1 hour. 5. Add distilled water up to the mark. Stir vigorously. 6. Standardize the solution by titration with oxalic acid, potassium hydrogen phtalate, etc. 7. Transfer the solution in a bottle and apply a label (date, name of the operator, name of the solution, normality).
How do you make a 0.001N HCL solution?
Add 50 mL of HCl 1 N in a 1 L volumetric flask, class A or B; add ca. 900 mL distilled water to the flask. Place the flask in a thermostat at 20 0C. After 30 min add slowly distilled water to the mark (1 L) and stir well the closed flask. Pour the solution in a bottle. Place a label with the date, concentration, name of the solution on the bottle.
How will you make standard solution?
mix a solute and solvent together and it will make a solution Increase the surface area of the solute with a mortar and pestle. Next measure out the mass of the solute. Add water and increase the temperature and use a magnetic stirrer. Do not fill to the necesary volume. Do not use a graduated cylinder instead use a volumetric flask. Pour solution into the flask. First measure the mass of the flask. rinse the beaker in which the solution was in. add more water to flask and fill to the needed volume. Then find the mass of solution.
