The major component of some antacids is Al(OH)_3. a. Write a balanced molecular
ID: 496354 • Letter: T
Question
The major component of some antacids is Al(OH)_3. a. Write a balanced molecular equation for the reaction of Al(OH)_3 with HCl. b. What mass of Al(OH)_3 is neutralized by 27.8 mL of 0.125 M HCl? A student standardized a NaOH solution using 15.00 mL of 0.250 M HCl as a primary standard. Titration required 42.73 mL of the NaOH. Calculate the molarity of the NaOH solution. A NaOH solution of unknown concentration was standardized against KHP. took 45.78 mL of the NaOH solution to completely titrate 1.256 g of KHP. Calculate the molarity of the NaOH. Calculate the pH when 25.0 mL of 0.250 M HCl is mixed with 35.0 mL 0.150 M HNO_3.Explanation / Answer
1)
a) Al(OH)3 + 3HCl -------------> AlCl3 + 3H2O
b) moles of HCl = Molarity x volume in L = 0.125 x 27.8 / 1000 = 0.003475 moles
0.003475 / 3 = 0.00116 moles Al(OH)3 required
moles = W/ MW
W = 0.00116 x 78
W = 0.09 g
mass of Al(OH)3 required = 0.09 g
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