Chemhw5.8

10 Questions  I  By Ionca
These questions deal with molarity and ppm concentrations.  remember table T and use the right formula. REMEMBER:  PERIOD# followed by FIRST & LAST NAME you must score at least 70

  
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1.  What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass = 26 grams/mole)?
A.
B.
C.
D.
2.  Base your answer to this question on the passage below and on your knowledge of chemistry. A safe level of fluoride ions is added to many public drinking water supplies. Fluoride ions have been found to help prevent tooth decay. Another common source of fluoride ions is toothpaste. One of the fluoride compounds used in toothpaste is tin(II) fluoride. A town located downstream from a chemical plant was concerned about fluoride ions from the plant leaking into its drinking water. According to the Environmental Protection Agency, the fluoride ion concentration in drinking water cannot exceed 4 ppm. The town hired a chemist to analyze its water. The chemist determined that a 175-gram sample of the town’s water contains 0.000250 gram of fluoride ions. Is the town's water safe to drink? [1]
3.  Base your answers to this question on the information below. A 2.0-liter aqueous solution contains a total of 3.0 moles of dissolved NH4Cl at 25°C and standard pressure. Identify the two ions present in the solute. [1]
4.  Which phrase describes the molarity of a solution?
A.
B.
C.
D.
5.  What is the molarity of a solution of NaOH if 2 liters of the solution contains 4 moles of NaOH?
A.
B.
C.
D.
6.  Base your answer to this question on the passage below and on your knowledge of chemistry. A safe level of fluoride ions is added to many public drinking water supplies. Fluoride ions have been found to help prevent tooth decay. Another common source of fluoride ions is toothpaste. One of the fluoride compounds used in toothpaste is tin(II) fluoride. A town located downstream from a chemical plant was concerned about fluoride ions from the plant leaking into its drinking water. According to the Environmental Protection Agency, the fluoride ion concentration in drinking water cannot exceed 4 ppm. The town hired a chemist to analyze its water. The chemist determined that a 175-gram sample of the town’s water contains 0.000250 gram of fluoride ions. How many parts per million of fluoride ions are present in the analyzed sample? [1]
7.  Molarity is defined as the
A.
B.
C.
D.
8.  Base your answers to this question on the information below. A 2.0-liter aqueous solution contains a total of 3.0 moles of dissolved NH4Cl at 25°C and standard pressure. Determine the molarity of the solution. [1]
9.  What is the molarity of a solution containing 20 grams of NaOH in 500 milliliters of solution?
A.
B.
C.
D.
10.  What is the concentration of a solution, in parts per million, if 0.02 gram of Na3PO4 is dissolved in 1000 grams of water?
A.
B.
C.
D.
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