Chem_171_Su_08_Q10_Antacid_Enthalpy_Key_Posted-984

Chem_171_Su_08_Q10_Antacid_Enthalpy_Key_Posted-984 - 1....

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Chem 171 Quiz 10 Version A (Key Antacid Enthalpy) 1. Write the products for the following reactions and balance the equations: Al(OH) 3 (s) + HCl(aq) -----> CaCO 3 (s) + HCl(aq) -----> MgCO 3 (s) + HCl(aq) -----> Mg(OH) 2 (s) + HCl(aq) -----> NaHCO 3 (aq) + HCl(aq) -----> Al(OH) 3 (s) + 3 HCl(aq) -----> AlCl 3 (aq) + 3 H 2 O(l) CaCO 3 (s) + 2 HCl(aq) -----> CaCl 2 (aq) + H 2 O(l) + CO 2 (g) (or H 2 CO 3 (aq) MgCO 3 (s) + 2 HCl(aq) -----> MgCl 2 (aq) + H 2 O(l) + CO 2 (g) (or H 2 CO 3 (aq) Mg(OH) 2 (s) + 2 HCl(aq) -----> MgCl 2 (aq) + 2 H 2 O(l) NaHCO 3 (aq) + HCl(aq) -----> NaCl(aq) + H 2 O(l) + CO 2 (g) (or H 2 CO 3 (aq) 2. How much heat in kilojoules is required to raise the temperature if 7.35 g of water from 21.0 to 98.0 o C. The specific heat of water is 4.18 J/g o C. q = mass x specific heat x T q = 7.35 g x 4.18 J / g o C x (98.0 – 21.0) o C q = 2366 J q = 2366 J x 1 kJ / 1000J = 2.37 kJ Chem 171 Quiz 10 Version B 1. a) In the analysis of commercial antacids, why doesn’t the antacid tablet dissolve completely in the HCl solution? b) How can you explain if there are variations in the volume of acid consumed for the same brand of antacid tablet? a)Fillers or inert ingredients (binders, glues) do not dissolve in the HCl solution.
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