Experiment on Concentration of Dilute Hydrochloric Acid by Titration
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Added on 2020-04-13
Experiment on Concentration of Dilute Hydrochloric Acid by Titration
Added on 2020-04-13
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This experiment was carried out in order to find the concentration of dilute hydrochloric acid by titration. The process is known as standardizing the hydrochloric acid. This experiment aims at:Using calorimetry to determine the concentration of copper sulfate.Using NaHCO3 and NaOH to standardize HCLFindings after titration RunInitialFinalTitre Rough0.0024.4024.4 10.0023.8528.85 223.8547,6523.85 30,0023.8023.80 Average23.82 Titre1234 AverageStart volume (ml)517.5447.625End volume (ml)34.542.533.633.536,025 Volume used 29.525.029.628.428.125a)Use of Sodium Carbonate to standardize HCL The reaction between sodium carbonate and HCL takes place in two stages and methyl indicator and phenolphthalein indicator were used in these experiments. The methyl indicator changes from yellow to pink at the end of titration after which the volumes below were recorded. [CITATION JCM10 \p 22 \l2057 ] Sodium Carbonate reacts with 1 mole of HCL to give NaHCO3 Na2CO3+ HCL---------------------NaHCO3 + NaCL NaHCO3 + HCL------------------NaCl +H2O + CO2CalculationsThe mass of Na2Co3 for 250cm3 0.1M is calculated by; Molarity= 0.1 Volume= 250cm3 Relative Atomic Mass= 106 Mass= 0.25 x 0.1x 106 Mass = 2.65g Moles=mass divided by RAM
= 2.65106¿¿Moles= 0.025 molesConcentration of Na2CO= mass divided by the volume obtained in the experiment = 2.6523.82¿¿ = 0.11125 The equation below is used to calculate the HCL concentration, Na2CO3 + 2HCL----------------------2NaCl + H2 O + CO2 1 mole 2moles 2 moles 1mole 1molAverage titre from the table = 23.82cm3 Volume of Na2CO3 used= 25cm3Molarity of Na2CO3= 0.1M M1V1= M2V2 25cm3x 0.1 x 1= M2 x 23.82 x 2 M2=25cmxo.123.82 HCL concentration = 0.052476Accuracy of the experiment To ensure that the experiment is accurate;The sodium used was in its purest stateThe sodium carbonate was heated to get rid water of crystallizationThe volumes used were accurately measured
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