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identification of a group 2 hydroxide

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Introduction

The Identification of a Group 2 Hydroxide Appreciation of Scale The equation for this reaction: The scale for this experiment will be in cm3 for this allows for accurate measurements to be taken for the titration, which will improve the accuracy of the investigation being carried out and so will provide a more accurate molecular formula for the group 2 metal hydroxide. The equation for this reaction states that 2 moles of hydrochloric acid reacts with 1 mole of the group 2 metal hydroxide solution, so this shows that the concentration of the hydrochloric acid needs to be twice that of the group 2 metal hydroxide solution, for the acid to fully react with the alkali. In this investigation the group 2 metal hydroxide solution could either contain calcium, strontium or barium, which means for the investigation there, needs to be an average molecular mass calculated to ensure the molecular formula is accurate. For this titration appropriate concentrations are 0.01M, for the group 2 metal hydroxide and 0.02M, for the hydrochloric acid which is provided as a standard solution, because for the equation of this reaction, 2 moles of hydrochloric acid reacts with 1 mole of the group 2 metal hydroxide, to ensure a complete neutralisation. A sensible volume for the group 2 metal hydroxide solution is 10 0cm3, so the titration can be repeated again without a new batch of the solution begin made, ...read more.

Middle

6. Take an initial reading from the burette as the start point, making sure the start point is recorded from the bottom of the meniscus. 7. Fill the conical flask with 25cm3 of the hydroxide solution, for it allows for more accurate measurements, press the end of the pipette against the inside of the conical flask to make sure that the pipette is empty, also make sure that a pipette filler is used, for sucking up the hydroxide solution instead of using your mouth, for it is dangerous to ingest any of the hydroxide solution due to that it is toxic. 8. Add a few drops of methyl orange indicator to the hydroxide solution, which will turn yellow in the hydroxide solution due to it being a base and the colour will turn orange when the base has been neutralised by the acid, which will be the end point of the titration 9. Place the conical flask under the burette and on top of a white tile to allow the colour change to be seen more clearly. 10. Next turn the burette tap on, so that the acid drips in to the conical flask at a controllable speed. 11. Constantly swirl the conical flask as the acid is being added to the base, to make sure that the colour of the solution is equally distributed in the solution, so the end point of the solution will be more easily recognisable. ...read more.

Conclusion

Moles of hydrochloric acid are 0.02 as already stated in the appreciation of scale and dm3 equals 1000. Calculation for Ar of group 2 metal N= x � (16 x 2) + (2 x1) Safety Review To ensure that this experiment is carried safely the following must carried out, firstly it is advised to wear goggles, gloves and a lab coat while carrying out this experiment to minimise the chance of the acid or the base coming into contact with your skin or eyes because they are corrosive and could damage or irritate your skin or eyes, if any of the acid or the hydroxide solution come into contact with your skin or eyes immediately rinse under cold water and inform your teacher, also to minimise the chance of the acid coming into contact with the eyes make sure the burette is below eye level. Secondly when using the pipette it is important that you use a pipette filler instead of using your mouth to suck up the hydroxide solution, because using your mouth means there is a chance of you ingesting some of the hydroxide solution, which is dangerous due to the hydroxide being toxic. Thirdly in case of any spillage of the acid or the hydroxide, follow the instructions of the hazard card for that substance which will probably include placing sand over the top of the spilled substance before cleaning it up. ...read more.

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