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The determination of the solubility of calcium hydroxide.

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Introduction

Aim The experiment practical I am going to do is all about the determination of the solubility of calcium hydroxide. This can be found by titrating the saturated solution against a solution of an acid whose concentration you know. The acid whose concentration we know is hydrochloric acid. The calcium hydroxide will be in limewater and this will have to be diluted before used. These two solutions will react together and a colour change will occur. Calcium hydroxide dissolves only slightly in water to form an alkali solution. Introduction A titration is when two solutions react together. It is a technique to find the concentration of unknown solution. It is a method of quantitative analysis. One solution, which has a known concentration, is filled into a burette and the second solution is placed in a conical flask. A solution of known concentration or known morality is called a standard solution. In each titration the solution with the unknown concentration is filled in the burette is added in small measured quantities to the solution in the conical flask until just enough has been added for the reaction to be complete. ...read more.

Middle

As if you make the hydrochloric acid too concentrated this can effect your titration results. Suitability: This is a very suitable and effective way to do and calculate a titration as is done this way all the time. It can show effective colour change. Risk assessment: Safety: Safety is very important when carrying out any practical experiment in the lab. Many general rules need to be followed in order to make sure we carry out our practical safely General rules: * Wear goggles at all time during the practical. * Wear lab coats to protect clothing. * If needed wear gloves. * Tie long hair back * Handle all glass equipment with care. Solutions: Calcium Hydroxide in lime water CORROSIVE = causes burns. Irritating to eyes, skin and respiratory system so do not inhale. Acid If: What to do: Protection Calcium Hydroxide swallowed Wash out mouth. Seek medical attention. DON'T BE SO STUPID!!! ,, ,, Solution gets into eyes Flood the eye gently with water for 10 minutes. If needed seek medical attention. Be very careful when handling. Wear gloves. ,, ,, If spilt on skin or clothes Remove contaminated clothing. ...read more.

Conclusion

A good technique will involve: Method can be improved by: * the solution in the volumetric flask needs thorough mixing * all equipment should be washed out using distilled water * the end point of the titration can only be determined accurately if the solution from the burette is added drip by drop with swirling as the end point is reached. * When an indicator is used in a titration only the minimum number of drops is added each time. There was not really any anomalous result as all the 3 titration's done has very close and similar readings The titration was done 3 times to improve the reading of the experiment. Any additional titration's done after 3 times were not really necessary to ensure that the results were accurate. The overall accuracy and reliability of the evidence that the experiment supplied is reasonably accurate as the 2 solution did react together well and a noticeable colour change from a pale orange to a permanent pink was visible. Due to the percentage error in the experiment technique is could have resulted in maybe the readings being slightly lower then they really should have been. Coursework Solubility of calcium hydroxide By Sabina fareed Reference chemical ideas book Chemistry for you by lawrie ryan Chemical ideas work sheets ...read more.

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