January 2010 Chemistry Regents #56-57

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Questions

Base your answers to questions 56 through 57 on the information below.

The dissolving of solid lithium bromide in water is represented by the balanced equation below.

56 Calculate the total mass of LiBr(s) required to make 500.0 grams of an aqueous solution of LiBr that has a concentration of 388 parts per million. Your response must include both a correct numerical setup and the calculated result. [2]

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Set Up

388 ppm=

X grams of LiBr

x1,000,000

500.0 g of solution

Answer==>0.194

57 Based on Table F, identify one ion that reacts with Br- ions in an aqueous solution to form an insoluble compound. [1]

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lead(II)  Pb2+   Hg22+ Ag+

On to Questions 58-60

 

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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