Filter Paper
In the fume hood, approximately 2g of Ca(OH)2 was dumped from a vail into a 250ml beaker. To avoid any left-over Ca(OH)2 inside the vail, certain amount of distill water wad added to it, and the vail was shook several times after the lid was closed. Pouring the solution in the vail into the beaker, and add distill water until it reached the 100ml line. Then, the beaker was put on top of a magnetic stir with a magnetic stir bar placed in it. Turning on the magnetic stirrer and allowing the stir bar to mix the solution thoroughly for 15 mins. Next, the magnetic stirrer was turned off and the solution was put to rest, where most solid contents were at the bottle of the beaker; temperature of the solution was then measured using a digital thermometer. A piece of filter paper was folded
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and added to a funnel, which was putted in a 250ml Erlenmeyer flask. Pouring the solution down a stirring rod slowly into the funnel, and let the solution drain through the filter paper. Later, a 5ml volumetric was used to transfer 5ml of saturated Ca(OH)2 to a new 125ml Erlenmeyer flask, so that the 250ml flask was covered with a watch glass and left in a fume hood. In the new flask, 2 drops of phenolphthalein was added.
Certain amount of HCl solution was poured into a burette for which the initial reading was recorded.
Placing the 125ml Erlenmeyer flask underneath, and starting to titrate, until the pink color of phenolphthalein just disappeared, in which the end-point was reached, and the final reading of the burette was recorded. Putting the 250ml Erlenmeyer flask back on to the magnetic stirrer with a stir bar inside and turn on both heat and its stirring function. A digital thermometer was put into the solution to give out the real-time temperature. When the temperature was in between 60-80 °C, the setting of the plate was adjusted for the temperature to maintain a at 72 +/- 1 °C for 5 mins. A heat resistant pad was used to remove the flask from the plate, and the stirrer was turned off. Then, the same process used in filtering and titrating room temperature Ca(OH)2 solution was used, except that after filtering, solution was cool down a little first and 10ml instead of 5ml of Ca(OH)2 was transferred to be titrated. The same process was repeated for filtering and titrating boiling Ca(OH)2, except once the solution was boiling, just let it boil for 5 mins, there was no need to adjust the
temperature.
and added to a funnel, which was putted in a 250ml Erlenmeyer flask. Pouring the solution down a stirring rod slowly into the funnel, and let the solution drain through the filter paper. Later, a 5ml volumetric was used to transfer 5ml of saturated Ca(OH)2 to a new 125ml Erlenmeyer flask, so that the 250ml flask was covered with a watch glass and left in a fume hood. In the new flask, 2 drops of phenolphthalein was added.
Certain amount of HCl solution was poured into a burette for which the initial reading was recorded.
Placing the 125ml Erlenmeyer flask underneath, and starting to titrate, until the pink color of phenolphthalein just disappeared, in which the end-point was reached, and the final reading of the burette was recorded. Putting the 250ml Erlenmeyer flask back on to the magnetic stirrer with a stir bar inside and turn on both heat and its stirring function. A digital thermometer was put into the solution to give out the real-time temperature. When the temperature was in between 60-80 °C, the setting of the plate was adjusted for the temperature to maintain a at 72 +/- 1 °C for 5 mins. A heat resistant pad was used to remove the flask from the plate, and the stirrer was turned off. Then, the same process used in filtering and titrating room temperature Ca(OH)2 solution was used, except that after filtering, solution was cool down a little first and 10ml instead of 5ml of Ca(OH)2 was transferred to be titrated. The same process was repeated for filtering and titrating boiling Ca(OH)2, except once the solution was boiling, just let it boil for 5 mins, there was no need to adjust the
temperature.