The daily output of stomach acid (gastric juice) is 1000 to 2000 mL. Prior to a

Question

The daily output of stomach acid (gastric juice) is 1000 to 2000 mL. Prior to a metal, stomach acid (Cl) typically has a pH of 1 42 What is the [H_3O^+] of the stomach acid One chewable tablet of the antacid Maalox contains 600. mg of CaCO_3. Write the neutralization equation, and calculate the milliliters of stomach acid neutralized by two tablets of Maalox. The antacid milk of magnesia contains 400. mg of Mg(OH)_2 pet teaspoon. Write the neutralization equation, and calculate the number of milliliters of stomach acid neutralized by 1 tablespoon of milk of magnesia. (1 tablespoon = 3 teaspoons)

Explanation / Answer

a) pH = 1.42 = -log[H3O+]

[H3O+] = 0.03802 M

b) chemical equation for neutralization :

CaCO3 + 2HCl ---> CaCl2 + H2CO3

moles of CaCO3 = 0.6 g/100.0869 = 6 x 10^-3 mols

So moles of HCl neutralized = 2 x 6 x 10^-3 = 0.012 mols HCl

mass of HCl neutralized = 0.012 x 36.461 = 0.437 g

mass of HCl enutralized by two tablets = 2 x 0.437 = 0.874 g

Let density of HCl = density of water being in excess, we get

ml of HCl neutralized = 874 ml

c) Chemical equation for neutralization :

Mg(OH)2 + 2HCl = MgCl2 + 2H2O

moles of Mg(OH)2 = 0.4 g/ 58.32 = 6.86 x 10^-3 mols

moles of HCl neutralized = 2 x 6.86 x 10^-3 = 0.0137 mols

amount of HCl neutralized with density = 1 g/ml = 0.0137 x 36.46 = 0.500 g = 500 ml

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