Question

The daily output of stomach acid (gastric juice) is 1000 mL. prior to meal, stomach acid Hcl typically has a ph of 1.42.
PartC.
calculate the milliters of stomachs acid neutralized by two tablets of Maalox
Part D
The antacid milk of magnesia contains 400 mg of Mg(Oh)2 per teaspoon. write the neutralization equations.?
part E what is the volumes in milliters of milk of magnesia ?

Answer 1

Part A:

I think you already calculated Part-A answer as [H+] =10^-pH = 10^-1.42 = 0.038 M

Part B
3HCl(aq) + Al(OH)₃(s) --> AlCl₃(aq) + 3H₂O(l)

Part C
Al(OH)₃ = 0.200 g
0.200 g / 78.0 g/mole = 0.00256 mole per tablet
moles of H₃O⁺ neutralized by 2 tablets = 3 x 2 x 0.00256 = 0.01536 moles
0.01536 mole / 0.0380 mole/liter = 404 mL of stomach acid

Answer: 404 mL

Part D
2HCl(aq) + Mg(OH)₂(s) --> MgCl₂(aq) + 2H₂O(l)

Part E:

400 mg = 0.4 g

moles Mg(OH)₂ = 0.4 g / 58.3197 g/mol = 0.00685874584 moles

moles of H₃O⁺ neutralized by 0.00685874584 moles Mg(OH)₂ = 2 x 0.00685874584 moles = 0.01371749168 moles

0.01371749168 mole / 0.0380 mole/liter = 361 mL of Mg(OH)₂

Answer = 361 mL

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