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To determine the enthalpy changes of reaction for some reactive metals, with hydrochloric acid
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| Submitted: Thu Jul 11 2002
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To determine the enthalpy changes of reaction for some reactive metals, with hydrochloric acid. Sodium carbonate can be used as a standard to determine acid concentration, because it is readily available in a pure and dry form. Here 7.5g is used to make up a 250cm solution with a concentration of 0.283 moldm .The calculations show this; The exact concentration of hydrocloric acid, is found by titrating it against the standard solution. Apparatus Chemicals 2 decimal place balance; HCl (exact weighing jar; concentration not known teat pipette; between 2.0 and 2.5moldm); pipette; burette; screened methyl orange; conical flask; anhydrous sodium carbonate. 250cm measuring flask and bung; 100cm measuring cylinder; white tile; clamp stand. Safety points. Solutions of HCl greater than or equal to 2moldm are irritant to the skin and eyes. A lab coat should be worn and direct contact with acid avoided. Na CO is also irritant, same preucautions should be taken. Preparation of the standard solution. Weigh the exact mass...
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