August 2015 Chemistry Regents #81-82

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Question 81-82

 

  Base your answers to questions 81 and 82 on the information below and on your knowledge of chemistry.

The gastric juice of the human stomach has a pH value of approximately 1.5. Hydrochloric acid in the gastric juice is necessary for the digestion process. However, excess hydrochloric acid may harm the stomach lining. One type of antacid uses Mg(OH)2(s) to neutralize excess hydrochloric acid in the stomach. This neutralization is represented by the incomplete equation below.

 Mg(OH)2(s) + 2HCl(aq) → _____ (aq) + 2H2O(ℓ)

81 Complete the equation in your answer booklet by writing the formula of the missing product. [1]

Answer-->   MgCl2(aq)

82 Describe the changes in both the hydrogen ion concentration and the pH of the gastric juice of a human after ingesting this type of antacid. [1]

Answer-->    Hydrogen ion concentration: decreases/lower

 pH: increases/higher

on to Questions 83-85

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-74  Questions 75-76  Questions 77-78  Questions 79-80  Questions 81-82  Questions 83-85
 

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