The following results were obtained:Īverage Specific Gravity of Solution A is 1.11g/mLĮxample 3 : Conc Hydrochloric acid Sol. In 2009 (12 years Later) the same solution was tested and labelled here as Solution A2. In 1996 a solution of conc HCl (labelled as Sol A) provided the following results:Īverage Specific Gravity of Solution A is 1.16g/mLĮxample 2 : Conc Hydrochloric acid Solution A2 in 2009 One can tare the weight after the previous reading and simply add over the next aliquot volume of acid and take the new weight.Ĭalculations Example 1 : Conc Hydrochloric acid Sol. Repeat this for 2 more times to have 3 weight readings and average out the result. Note the volume used and weight read out. Transfer carefully 10ml (or 25ml) of Acid solution using a volumetric pipette into the beaker. Tare an empty dry 100mL beaker over a balance Once the specific gravity and Molarity are determined, the percentage is calculated from the fraction of the weight of theoretical Acid molecules in 1000g solution (Molarity x RMM) divided by the actual weight of 1000g acid (specific gravity x 1000). These moles are converted to Molarity of the Acid taking into account the dilution. HCl (aq) + NaOH (aq) - > NaCl (aq) + H2O (l)įrom the NaOH titre volume, the number of moles of NaOH are calculated, which from the reaction = 1 : 1, it is equal to the moles of HCl. The reaction is follows:ĪCID (aq) + ALKALI (s) - > SALT (aq) + WATER (l) The Principle of this test is to dilute the acid and find the titrate volume of known molarity of NaOH required to neutralize the Acid dilution. Specific gravity is easily found by measuring the weight of a fixed volume of acid and calculated it by the formula Mass / Volume. The calculation giives the following results:Ī number of examples are given, all based on true solution that I have in my home Lab. The procedure is hence aimed for concentrated solution more than 1Molar. Srong acids easily loose their concentration by decompostion and absorption of moisture from air. This procedure is useful to find the concentration level of a concentrated solution of Hydrochloric Acid which perhaps is old and is not as strong as its original concentration marked on the commercial bottle. Finding the Concentration of HYDROCHLORIC ACID įinding the Concentration of HYDROCHLORIC ACIDġ.2 - Added new examples (retested samples in Aug 2009)
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