A CaCO-filled substrate is being used to neutralize acid. Determine the rate of reaction for the CaCO within the substrate to neutralize the 250 mL of acid water.

Given:

• CaCO3 component density = 2.7 g/cm^3
  • 70% wt volume of blend
  • 25.92 cm^3 by volume
  • Percent CaCO by volume = 42.65%
    • For example, there is 43% CaCO on the surface of the substrate that is used to neutralize this acid water
• The acid water is complex and uses the following equations:
  • Ferrous iron Fe²⁺ + O₂ + 5/2 H₂O Fe(OH)₃ + 2H⁺
  • Ferric iron Fe³⁺ + 3 H₂O Fe(OH)₃ + 3 H⁺
  • Aluminum cation Al³⁺ + 3 H₂O Al(OH)₃ + 3 H⁺
  • Manganese cation Mn²⁺ + O₂ + H₂O MnO₂ + 2 H⁺

Overall: 4 FeS₂ + 15 O₂ + 14 H₂O 4 Fe(OH)³+ 8 H₂SO₄

• The untreated acid water also has a:
  • 3.43 pH level
  • Measured acidity at 92 mg CaCO/L
• The untreated acid water contains the following elements, according to ICP results:

	UNITS	COMPONENT	SAMPLE 1
SO	ppm	sulfate	502.74
Mg	ppm	magnesium	40.42
Al	ppm	aluminum	7.55
Na	ppm	sodium	12.62
Cl	ppm	chloride	18.28
Ca	ppm	calcium	101.7
K	ppm	potassium	5.89
Mn	ppm	manganese	1.74
Fe	ppm	iron	4.95

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