• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigation of Energy changes in reaction between NaOH and HCL.

Extracts from this document...

Introduction

Chemistry Coursework Investigation of Energy changes in reaction between NaOH and HCL. Aim My aim is to find out the heat given out during the neutralisation of HCL and NaOH. HCL will be a constant and NaOH will be varied and mixed with H2O. Background Knowledge Neutralisation is when an acid reacts with an alkali to form a salt and water. Eg. HYDROCHLORIC ACID + SODIUM HYDROXIDE SODIUM CHLORIDE+WATER HCL (aq) + NaOH (aq) NaCl (aq) + H2O (l) ACID + ALKALI SALT + WATER In the above equation the acid HCL is being reacted with the alkali NaOH and a salt NaCl and water is produced. Properties Of Acids & Alkalis Acids Alkalis Acids corrode active metals. Alkalis corrode protein. Acids turn blue litmus into red. Alkalis turn red litmus paper into blue. Acids taste sour. Alkalis taste biter. Acids release a hydrogen ion into aqueous solution. ...read more.

Middle

2) The chemical nature of the acid or alkaline must be kept constant. If the acid is stronger, more heat will be produced, and if the acid is weak, less heat must be produced. Apparatus Beaker Polystyrene cup Cotton wool Thermometer Plastic lid Safety mat Safety goggles Method Acid (HCL)/cm3 Alkaline (NaOH)/cm3 Water / cm3 Total Volume / cm3 25 25 0 50 25 20 5 50 25 15 10 50 25 10 15 50 25 5 20 50 I will have to first measure out the constant which is HCL, then the variable which is NaOH and if any water. When pouring the acid/alkaline/water, I have to make sure that the measuring cylinder is level to my eyes so I don't get more or less solution that I need. I will measure the temperature of both solutions (constant and variable) and take the mean as my starting temperature. ...read more.

Conclusion

(b) I will have to make sure none of the heat is lost to the surroundings, to do this, I will mix the acid, alkali, water in a polystyrene cup, wrapped around in cotton wool and then placed in a beaker, a plastic lid was used to cover the top of the cup and a hole was there for the thermometer to go through. Safety I will have to make sure not to spill any of the acid or alkali anywhere; I will have to wear goggles, as the acid is harmful. Analysis Evaluation My method was fairly good as I noticed hardky any heat had escaped. To improve on more efficiency I could have added cotton wool on the lid as heat rises and this would have stopped it from escaping. Conclusion The graph supports my prediction that the more concentrated the variable, the more heat would be given off and as you can see, that is the same on my result graph. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. Marked by a teacher

    Chemistry Investigation on neutralisation reaction.

    5 star(s)

    Moles of acid used = volume x concentration Where volume is in litres and concentration is in moles/dm3. =0.025 x 2 = 0.05 moles 1 mole of acid reacts with 1 mole of alkali. NaOH(aq) + HCl(aq) ? NaCl(aq) + H2O(l)

  2. Marked by a teacher

    Enthalpy of Neutralisation.

    3 star(s)

    Another 5m of NaoH was poured into the same calorimeter and 5m of NaoH was continuously added every 30 seconds until the 50cc of the chemical was emptied into the calorimeter cup. The same method was used for experiments 1 and 2 respectively, using the chemicals required for both experiments accordingly.

  1. To investigate the effect of concentration on the temperature rise, heat evolved and heat ...

    = 4275 / (50 x 4.2) = 20.357 �C 4. For the reaction of 25 cm3 of 4 M HCl and 4 M NaOH Moles of NaOH = c x v = 4 M x 0.025 dm3 = 0.025 moles Heat evolved = moles x 57 kJ = 0.1 x

  2. Science Coursework Investigation ions

    The same procedure should be repeated for each metal. Test should be repeated at least two or three times to prevent mistakes and to make the test accurate and fair. All chemical reactions involve reactants which when mixed may cause a chemical reaction which will make products. In my case the reactants are hydrochloric acid and magnesium.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work