January 2011 Chemistry Regents #81-83

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Questions

Base your answers to questions 81 to 82 on the information below.

A student, wearing chemical safety goggles and a lab apron, is to perform a laboratory test to determine the pH value of two different solutions. The student is given one bottle containing a solution with a pH of 2.0 and another bottle containing a solution with a pH of 5.0. The student is also given six dropping bottles, each containing a different indicator listed in Reference Table M.

81 State one safety precaution, not mentioned in the passage, that the student should take while performing tests on the samples from the bottles. [1]

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Wear protective gloves.

Avoid spills.

Note: Do not allow credit for “wearing goggles” or “wearing an apron.”

82 Identify an indicator in Reference Table M that would differentiate the two solutions. [1]

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methyl orange

83 Compare the hydronium ion concentration of the solution having a pH of 2.0 to the hydronium ion concentration of the other solution given to the student. [1]

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The hydronium ion concentration is 1000 times greater in the solution having a pH of 2.0.

The other solution has a lower H+ ion concentration.

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-53 Questions 54-55 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 
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