Experiment 12 THE DETERMINATION OF THE NEUTRALIZING ABILITY OF ANTACIDS The Pre

Question

Experiment 12 THE DETERMINATION OF THE NEUTRALIZING ABILITY OF ANTACIDS The Pre LabB A 1.032 gram sample of an antacid was dissolved in 50 mL of water. Then a 49.33 mL portion of 0.488 M HCI was added to the flask. completely neutralized and the unneutralized hydrochloric acid remaining flask required 29.33 mL of 0.510 M NaOH to completely neutralize it. 1. The antacid was in a) The source of all of the acid used HCI. What are the sources of the two bases that react with this HC? in the experiment is the hydrochloric acid, b) How many moles of the acid,HCI,are used in the experiment? moles ofsolute=volume (in liners, x concentration solute (in molesier) c) What must be the total of the number of moles of HCl neutralized by the antacid plus the number of moles of HCI neutralized by the NaOH? d) Calculate the number of moles of the Na0H added during the experiment. moles of solute -volume (in litens) x concentration solute (in mole/liser) e) How many moles of the total moles of HCl originally present does the added See Figure 12.2a NaOH react with during its neutralization reaction? ) How many moles of the total moles of HCl originally present must the antacid react with during its neutralization reaction? 8) How many moles of HCl are neutralized for each gram of antacid tablet used?

Explanation / Answer

1. (a) Antacid contains milk of magnesia I.e Magnesium hydroxide= Mg(OH)2

Second base is sodium hydroxide (NaOH)

(b) Moles of acid used = volume of acid in liter * concentration of acid

= 0.0493L * 0.488 M= 0.0240 moles of HCl

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