CHEM 112 Experienens 4. Uise the resction below to answer the following question
ID: 547935 • Letter: C
Question
CHEM 112 Experienens 4. Uise the resction below to answer the following questions: a. How many moles of stomach acid would be neutralized hy ooe tablet of Malox that contains 600 mg of calcium carbonate? b. Assuming the volume of the stomach to be L.0L. with a pH of I, wbat will be the new pH of the stomach acid resulting from the ingestion of one Tums tablet that contains 500 mg of calcium carbonate? Each S-mL teaspoonful of Extra Strength Maalox Plus comtains 450 mg of magnesium hydroxide and 500 mg of aluminwm hydroxide. How many moles of hydronium ion are neutralized by one teaspoonful of Extra Strength Maalox Plus? 5.Explanation / Answer
Q4
a)
moles of acid neutralized by 600 mg oc CaCO3
mol of CaCO3 = mass/MW = 0.6/100 = 0.6*10^-2
2 mol of H+ = mol of CaCO3
mol of H+ neutralized = 2* 0.6*10^-2 = 0.012 mol of H+
b)
if v = 1 L, then pH = 1
find new pH after adding 500 mg = 0.5 g
mol of CaCO3 = mass/MW = 0.5/100 = 0.5*10^-2
2 mol of H+ = mol of CaCO3
mol of H+ neutralized = 2* 0.5*10^-2 = 0.010 mol of H+
initial pH: 1
[H+] = 10^-pH = 10^-1
V = 1 L, so mol of [H+] = 10^-1 = 0.1
mmol of H+ left = 0.10 - 0.010 = 0.09
[H+] = 0.09/1 = 0.09 M
pH = -log(H+) = -log(0.09)
pH = 1.045