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Determine the concentration of sulphuric acid

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Introduction

Verity Reeves Centre number: 30290 Candidate number: 4733 Planning: Determine the concentration of sulphuric acid Risk assessment * As sulphuric acid and sodium hydroxide are both corrosive, I will wear gloves, goggles and lab coat when performing the experiment * If any breakages occur I will carefully dispose of the glass in a suitable bin. * If any spillages occur during my experiments I will clean them promptly. Dilution of H2SO4 As the concentration of the sulphuric acid~10moldm-3, it is too concentrated for my experiments so I will dilute it to approx 0.05moldm-3. Apparatus - * 50.0cm3 pipette * 100.00cm3 graduation flask * deionised water * dropper * 50.0cm3 pipette * 250.00cm3 graduation flask � 2 Method- * Pipette 50.0cm3 of the aqueous sulphuric acid into a 100.00cm3 graduation flask * Add deionised water up to the graduation mark and agitate to ensure a homogenous solution. * Pipette 25.0cm3 of the new solution into a 250.00cm3 graduation flask * Add deionised water up to the graduation mark and agitate. * Pipette 25.0cm3 of the new solution into a 250.00cm3 graduation flask * Add deionised water up to the graduation mark and agitate. ...read more.

Middle

* 25.0 cm3 Measuring cylinder Diagram- Method- * Fill the trough 3/4 full of tap water * Ensure the tap of the burette is closed. * Fill the Burette with tap water, place thumb firmly over the open end and turn burette upside down and place the open end under the surface of the water in the trough (burette should remain almost full of water). * Clamp the burette vertically and upside down, so the end is about 3cm above the bottom of the trough * Record the initial volume of the burette (readings will be upside down) * Using a 25.0cm3 measuring cylinder, measure 20.0cm3 of sulphuric acid (approx 0.05moldm-3) and add to the boiling tube. Verity Reeves Centre number: 30290 Candidate number: 4733 * Using the weighing boat, measure 1g of MgCO3 and then add to the boiling tube, immediately fit the bung and delivery tube on to the boiling tube. * Make sure that the end of the rubber delivery tube us placed into the open end of the burette * Leave for 5 minutes, and then record the final volume reading on the burette. ...read more.

Conclusion

+ H2SO4(aq) � H2O(aq) + CO2(g) + MgSO4(s) As I am using a burette capable of containing 50.00 cm3 of gas, my target volume of CO2 evolved is ~ 25.00 cm3/24.00 cm3 1 mole of gas at RTP = 24dm3 24 cm3/24000= 0.001 moles of CO2 Mole Ratio- H2SO4: CO2 1: 1 : 0.001 Therefore 0.001 moles of H2SO4 (~ 0.05 moldm-3) is needed to produce 24.00 cm3 of CO2 Volume of H2SO4 0.001 moles of H2SO4, I will use the same approx concentration of H2SO4 ~ 0.05 moldm-3 as I have already prepared it. Volume = moles / concentration = (0.001 / 0.05) � 1000 =20.0cm3 Mass of MgCO3 F.mass of MgCO3= 24.3+ 12.0 + (3 � 16.0) = 84.3 Mass= formula mass � Moles = 84.3 � 0.001 ~ 0.0843g In order to ensure that all of the aqueous sulphuric acid reacts I will use MgCO3 in excess and so I will use 1g of MgCO3. [Total words = approx 617] Verity Reeves Centre number: 30290 Candidate number: 4733 Reference- * Indicators - http://www.chemguide.co.uk/physical/acidbaseeqia/indicators.html * A-Level Chemistry, 3rd Edition, E. N. Ramsden page 71-74, Volumetric Analysis * Cambridge Advanced Sciences, Chemistry 1, 1 ...read more.

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