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# People take antacids, such as milk of magnesia, to reduce ISBN: 9780321910295 34

## Solution for problem 97P Chapter 14

Introductory Chemistry | 5th Edition

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Problem 97P

People take antacids, such as milk of magnesia, to reduce the discomfort of acid stomach or heartburn. The recommended dose of milk of magnesia is 1 teaspoon, which contains 400 mg of Mg(OH)2. What volume of HCl solution with a pH of 1.1 can be neutralized by 1 dose of milk of magnesia? (Assume two significant figures in your calculations.)

Step-by-Step Solution:

Solution 97P:

Here, we are going to calculate the volume HCl required to neutralize 1 dose of milk of magnesia.

Step 1:

We know,

pH = -log [H+] = 10-pH = 10-1.1

=  0.0794 M = 0.0794 mol/L

Step 2:

Mass of 1 tablespoon Magnesia Mg(OH)2 = 400 mg = 0.4 g

Molar mass of Mg(OH)2 =58.319 g/mol

Amount of Magnesia = = 0.00685 mol

Thus the concentration of [OH-] =  0.00685 mol x 2  = 0.0137mol

Step 3 of 3

##### ISBN: 9780321910295

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