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A titration to determine the ratio of moles of Sulfamic acid to Sodium Hydroxide in a neutralisation reaction

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Introduction

Glen Musgrove 17/12/02 A titration to determine the ratio of moles of Sulfamic acid to Sodium Hydroxide in a neutralisation reaction Aim To determine the stoicheometric relationship between Sulfamic acid and Sodium Hydroxide in a neutralisation reaction, hence finding the bascity of Sulfamic acid. Hypothesis I predict that the ratio of moles of Sulfamic Acid and Sodium hydroxide will be 1:1 and they will react like this:- Safety When carrying out this practical wear safety glasses at all times. When filling the burette hold the funnel slightly above the rim so as to break the seal allowing air to leave and fluid to replace it instead of the funnel filling up. The above helps to prevent you over filling the burette and it spilling over. Always fill the burette after moving it lower down so that if it does spill over it does not pour onto you or into your eyes. Wash your hands thoroughly after handling any Acids or Bases. Do not rub your eyes or put your hands or fingers in your mouth at any point during the experiment. Do not sit at the desk as this may prevent you moving in the event of a spillage. Equipment List >Safety glasses >50 cm3 Burette. >25 cm3 Pipette. >Pipette filler. >250 cm3 Graduated flask. >Conical flask. >Boss clamp and Stand. >White tile. ...read more.

Middle

there is more than one Hydrogen that can be given off as a H+ ion, so the bascity is unknown. It could give off any one, two, or three of the Hydrogen atoms dependant on its bascity. Its bascity is between 1 and 3 so there are three possible reactions which could take place. A general formula for the reaction is:- (n)NaOH + NH2SO3H � NaNSO3H(3-n) + (n)H2O (where (n) is the bascity of the acid) The following three reactions could occur:- 1/ NaOH + NH2SO3H � NaNSO3H2 + H2O bascity is 1 and ratio is 1:1 2/ 2NaOH + NH2SO3H � NaNSO3H + 2H2O bascity is 2 and ratio 1:2 3/ 3NaOH + NH2SO3H � NaNSO3 + 3H2O bascity is 3 and ratio is 1:3 Research I researched Sulfamic Acid on the internet and in textbooks and found that it is a mono-basic acid which has the following formula and structure:- NH2SO3H Sulfamic Acid is a Zwitterion, a molecule with two charges that counteract each other, the Nitrogen and Oxygen have a greater pull on the bond pair of electrons due to there high electro-negativity, this causes the bond to be polar, the Nitrogen and Oxygens draw the electrons closer and become slightly negative, the Hydrogens become positive because the negative electrons are further away. ...read more.

Conclusion

The volume of NaOH added from the burette was measured accurate to 0.1cm3 at 20?C. The Sulfamic Acid was measured with a pipette which measures 25cm3 at 20?C. The mass of Sulfamic Acid solid measured was accurate to .001 grams. The graduated flask measures 250 cm3 at 20?C. When measuring liquids the meniscus must be taken into account, due to surface tension the surface within the pipette burette etc is curved. The meniscus is always lined up with the bottom touching the line and the line being held at eye level so that it is a solid line and not a cylinder like you would see if it was above or below eye level. This is why there is a continuous line around the glassware. When using a burette so long as the meniscus is measured from the bottom at both the start and end point it will not effect the accuracy unlike in a pipette. When filling the burette always remove the funnel because a drop of reagent could fall into the burette altering the start point. When moving solids from one container to another or when adding liquids always wash with distilled water to make sure all of the substances enters the vessels. Workings No of Moles = Mass(g) � Mr Molarity = Moles(m) � Vol (dm3) Ma x Va = Mb x Vb Na Nb Formula Working Ma Va Na Mb Vb Nb ...read more.

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