4. Titrate the excess acid (acid not neutralized by the antacid) with NaOH solution to a phenolphthalein endpoint that persists for 30 seconds. 5. From the known concentration of the HCl solution, calculate the number of moles of HCl added to each sample. 6. From the concentration of the NaOH solution, calculate the number of moles of NaOH

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    After this, obtain the HCl and NaOH solutions and record the molarities on the stock bottles. Next, put 15 - 25 mL of HCl solution into each of two clean Erlenmeyer flasks and record the exact volume of HCl used in each Erlenmeyer flask. Add one of the antacid tablets to each flask and heat gently for 1-2 minutes to help dissolve the tablets.

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    A student determined the percentage of the active ingredient magnesium hydroxide, Mg(OH) 2, in a 1.24 g antacid tablet. The antacid tablet was added to 50.00 cm 3 of 0.100 mol dm −3 sulfuric acid, which was in excess.

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