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

The Decomposition of Sodium Hydrogen Carbonate

Extracts from this document...


TO FIND ?H FOR A REACTION WHICH IT IS NOT POSSIBLE TO MEASURE THE ENTHALPY CHANGE DIRECTLY ? In this experiment you are going to find ?Hreaction for the decomposition of sodium hydrogen carbonate: 2NaHCO3 (s) --> Na2CO3(s) + CO2(g) +H2O(l) by an indirect method. You are going to experimentally determine ?Hreaction for the reactions: Na2CO3(s) + 2HCl(aq)-->2NaCl(aq) + CO2(g) +H2O(l) and NaHCO3(s)+ 2HCl(aq)--> NaCl(aq) ...read more.


(i) To find ?Hreaction for Na2CO3(s) + 2HCl(aq)-->2NaCl(aq) + CO2(g) +H2O(l): ? Weigh out accurately about 2.0g of anhydrous sodium carbonate. ? Place 50cm� of the hydrochloric acid provided (in excess) in a plastic beaker. ? Record the temperature of the acid at half minute intervals. After 31/2 minutes add the anhydrous sodium carbonate, do not record the temperature. ? Stir vigorously with the thermometer. ? ...read more.


16.1 5 22.0 16.1 51/2 22.0 16.2 6 21.9 16.2 61/2 21.9 16.3 7 21.9 16.5 This table above shows the temperature change in �C. CALCULATIONS Sodium Carbonate Temperature Rise from 19.4�C to 22.0�C (a rise of 2.6�C)=2.6K Heat energy given out = mass of mixture x specific heat capacity x temperature rise of mixture M=0.05Kg Heat Capacity=4180J/Kg/K. Therefore heat given out= 0.05 x 4180 x 2.6 = 53.4 Kj. Using 2.07g of Na2CO3 (Mr=(23x2)+14+(16x3)=108) I.e. 2.07moles = 0.019167 108 ?H=53.4/1000 = 2.786KJ/mol or 2.79KJ/mol 0.019167 ...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. The aim of this experiment is to find the enthalpy change for the decomposition ...

    make sure people who are working around the spillage are aware of it. Wear a lab coat as any chemicals could lead to damage on clothing. Calculation I am using 50cm� of HCl acid so the stoichiometry has to be 1:1.

  2. Analysing; Enthalpy of Decomposition of Sodium Hydrogencarbonate

    + Ar (Hydrogen) +Ar (Carbon) + 3xAr (Oxygen) = 23.0 + 1.0 + 12.0 + 3 x 16.0 = 84 Moles of NaHCO3 used = mass of solid used Mr = 3.500/84 = 0.042 mol Mass of acid = volume x density = 30.00 x 1 = 30.0 grams Mass of Solution = mass of acid + mass

  1. Indirect determination of enthalpy change of decomposition of sodium hydrogen carbonate by thermochemical measurement ...

    A graphical representation of the apparatus can be shown as follows: Using a 25 cm3 burette, I accurately measured 50cm3 of 2M hydrochloric acid, and carefully poured this into my calorimeter. I then put the thermometer into place and recorded the temperature of the acid at 30 s intervals for the next three minutes.

  2. Copper carbonate decomposition

    CuCO3 : CO + O 1 mole : 1 1/4 moles 2.08 x 10 = 1.664 x 10 3 1.25 Then I will use this equation: - Moles = Mass Mr of CuCO3 is 63.5 + 12+ (16 x 3)

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