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Chemistry Lab Report PART 1 Aim: 1) To make up 100 cm3 of a buffer solution of pH 5.2 To make an appropriate buffer, the ratio of the volumes of the acid and its salt needs to be calculated. To find the volumes: The pKa value for 0.5 M ethanoic acid and 0.5 M sodium ethanoate is 4.76. To make the buffer pH 5.2: CH3COOH + H2O - CH3COO- + H3+O CH3COONa › CH3COO- + Na+ Using the equation previously stated: 5.2 = 4.76 - log (A-)/(HA) 10-0.44 = (A-)/(HA) 0.363 = (A-): (HA) Therefore, 100 x 0.363/1.363 = 26.6 ± 0.1 cm3 acid (ethanoic acid) is required 100 - 28.46 = 73.4 cm3 ± 0.1 cm3 salt (sodium ethanoate) is required Apparatus: 250 mL beakers, 50 cm3 burette Method: 1) Using a burette measure out 73.4 ± 0.1 cm3 of sodium ethanoate. (Rinse the burette with water at regular intervals) 2) Then, using the burette measure out 26.6 ± 0.1 cm3 of ethanoic acid. Add them 3) Then,...

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