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() 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]

  <==>   +  

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H2O() <==>H+(aq) + OH(aq)

2H2O() <==>OH(aq) + H3O+(aq)

water() <==>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]

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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]

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OH

hydroxide ion

79 What is the color of thymol blue indicator when placed in a sample of milk of magnesia? [1]

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blue

 

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