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Calculate the Normality of the HC1 using the following equation: <br /> Ni = (N2V2)/Vl, where: • <br /> V2 = Volume of NaOH used. <br /> N2 = Normality of NaOH used. <br /> Vl = Volume of HCl used. <br /> Ni = Calculated Normality of HCl. <br /> 6. Hydrochloric acid (HCl) , approximately 0.1 N: Dilute 200 ml of 0.5 N <br /> HCI to a volume of 1 liter with distilled water. Standardize solution as <br /> in 3.2.3.3. 5, but use 20 ml of the known Normality NaOH prepared in 3.2.3.3 <br /> No. 4. <br /> 7. Hydrochloric acid (HCI) , I part acid to 3 parts water: Dilute 250 ml of <br /> concentrated HCl with 750 ml of distilled water. <br /> 3.2.3.4 Materials- <br /> 1. Flasks, Erlenmeyer, 250 ml. <br /> 2. Buret, 100 ml (one required for each acid and one for each base). <br /> 3. Hotplate, steam bath can be substituted. <br /> 4. pH meter (Corning Model 12 or equivalent) eq�iipped with combination i <br /> electrode. <br /> 5. Balance, can be read to 0.01 g. <br /> 3.2.3.2 Procedure (revised and updated from Smith et al. , 1974)- <br /> 1. Place approximately 0.5 g of sample (less than 60 mesh) on a piece of <br /> --aluminum-foil. — - <br /> 2. Add one or two drops of 1:3 HCl to the sample. The presence of CaCO3 <br /> is-indicated by a bubbling or audible "fizz." <br /> 3. Rate the bubbling or "fizz" in step 2 as indicated in Table 1. <br /> 4. Weigh 2.00 g of sample (less than 60 mesh) into a 250 ml Erlenmeyer <br /> flask. <br /> 5. Carefully add HC1 indicated by Table 1 into the flask containing sample. <br /> 6. Heat nearly to boiling, swirling flask every 5 minutes, until reaction <br /> is complete. NOTE: Reaction is complete when no gas evolution is visible <br /> and particles settle evenly over the bottom of the flask. <br /> u <br /> 49 <br />