June 2010 Chemistry Regents #76-79

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Base your answers to questions 76 through 79  on the information below. In liquid water, an equilibrium exists between H2O(ℓ) molecules, H+(aq) ions, and OH−(aq) ions. A person experiencing acid indigestion after drinking tomato juice can ingest milk of magnesia to reduce the acidity of the stomach contents. Tomato juice has a pH value of 4. Milk of magnesia, a mixture of magnesium hydroxide and water, has a pH value of 10. 76 Complete the equation in your answer booklet for the equilibrium that exists in liquid water. [1]   <==>   +   HIGHLIGHT TO SEE THE ANSWER H2O(ℓ) <==>H+(aq) + OH−(aq) 2H2O(ℓ) <==>OH−(aq) + H3O+(aq) water(ℓ) <==>hydrogen ion(aq) + hydroxide ion(aq) 77 Compare the hydrogen ion concentration in tomato juice to the hydrogen ion concentration in milk of magnesia. [1] HIGHLIGHT TO SEE THE ANSWER NOTE=just say it is greater The H+ ion concentration in tomato juice is 106 times greater. The hydrogen ion concentration in tomato juice is greater than that in milk of magnesia. Milk of magnesia has a lower concentration of H3O+ ions. 78 Identify the negative ion found in milk of magnesia. [1] HIGHLIGHT TO SEE THE ANSWER OH− hydroxide ion 79 What is the color of thymol blue indicator when placed in a sample of milk of magnesia? [1] HIGHLIGHT TO SEE THE ANSWER blue   Next Questions

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