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Determine the Concentration of Limewater Solution

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Introduction

Determine the Concentration of a Limewater Solution Aim: The aim of this experiment is to determine the concentration of a limewater solution using hydrochloric acid. Introduction: To carry out this experiment, the method that will need to be used will be a titration. In this experiment, 250 cm3 of limewater with a concentration of 1g dm-3 will already be provided. Also, 2.00 mol dm-3 of hydrochloric acid is also provided, however, this acid is too concentrated and it will need to be diluted, before it can be used. I will be planning an experiment which will allow me to accurately determine the concentration, in g dm-3, of the limewater. I will be using an indicator to determine the point where the solution becomes neutral and when all of the limewater in the flask has reacted with the acid in the burette. A suitable indicator to use for this reaction would be methyl orange as a distinct colour (more obvious change than using methyl orange) change can be seen going from orange to pink, in this reaction. Diluting the Hydrochloric Acid As I stated in the introduction, I will need to dilute the acid as it is too concentrated. ...read more.

Middle

2) Place the hydrochloric acid carefully into the volumetric flask using the pipette. Make sure that all of the acid is added. 3) Fill up the volumetric flask, containing the HCl, up to the 250cm3 mark making sure that it is exact. If it is not exact, the HCl will need to be prepared again. You should measure the solution at eye level to ensure accuracy. 4) Shake the flask gently but firmly to ensure that all of the HCl is evenly diluted with the distilled water. 5) Transfer all of the, now diluted, acid into the beaker. The 0.02 moldm-3 solution of HCl is now prepared and all apparatus used can be washed out and put to the side. Method of Titration List of Apparatus � 25cm3 Graduated Pipette � Pipette Safety Filler � Burette � Burette Clamp and Retort Stand (assembled correctly) � Funnel � Wash Bottle � Phenolphthalein Indicator � White Tile � Two 250cm3 Conical Flasks � Beaker containing the 250cm3 of 0.02 mol dm-3 HCl Solution � Beaker containing the 250cm3 of Limewater with the Unknown Concentration (You must have enough solution to repeat the experiment 4 0r 5 times) ...read more.

Conclusion

Goggles, lab coat and gloves should be worn at all times when handling this acid. Calcium Hydroxide This is also corrosive and is identified as a skin or sensory organ toxicant so is quite harmful. Always wear goggles gloves and a lab coat when handling this substance and never touch it with bare hands. Glassware When smashed, can cause severe cuts and injuries. If broken do not touch the pieces with bare hands. Call a technician or teacher to sweep it up and put it in the glass disposal bin. General a) The funnel could cause a hazard and any chemicals dipping off it if still in the burette. This could also cause inaccurate results if it is in the burette and not being used b) The work area could cause trips or falls when handling hazardous chemicals which may results in severe injury. c) Equipment with slight traces of chemicals may cause errors in the experiment and potential harm if the equipment looks empty. a) Remove the funnel as soon as it has finished being used. b) The work area must be kept clean and tidy before any practical is started. When equipment is no longer being used, set it aside or clear it away. c) Wash out all equipment before and after use to remove all traces of chemicals. ...read more.

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