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Chemistry

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1).Commercial Alka Seltzer tablets contain citric acid. Why is this included in the tablets?

A.

 The acid generates necessary chloride ions.

 

B.

 The acid reacts with the basic bicarbonate ions to form carbon dioxide gas.

 

C.

 The acid inhibits bicarbonate from forming carbon dioxide.

 

D.

 The acid causes an increase in the temperature of the solution.

 

 

2.As the percent of vinegar increased, the mass of the 35 mL of liquid in the beaker (before Alka Seltzer was added) increased. What is a possible explanation for this result?

A.

 The vinegar contains a contaminant.

 

B.

 The density of vinegar is greater than the density of water.

 

C.

 The production of CO2 gas changed the mass.

 

D.

 The dissociation of vinegar increased the mass.

 

 

3.Why was vinegar added to the reaction?

A.

 The acid reacts with the bicarbonate ions to generate water and carbon dioxide gas.

 

B.

 The vinegar generates necessary chloride ions.

 

C.

 The vinegar inhibits bicarbonate from forming carbon dioxide.

 

D.

 The vinegar causes an increase in the temperature of the solution.

 

 

4.Use the graph below to answer the following question. What is the mass lost once the Alka Seltzer becomes the limiting reagent? Choose the closest answer. 

 

A.

 0.883 g

 

B.

 1.30 g

 

C.

 0.682 g

 

D.

 1.67 g

 

 

 

5.Use the graph below to answer the following question.  At low concentrations of vinegar, the reaction is limited by the concentration of acid whereas at high concentrations, the reaction is limited by the concentration of Alka Seltzer. Where does the transition between these limiting reactants occur?

Between 0 and 5mL of vinegar

 

6.What was the combined mass of the beaker containing 0 mL of vinegar and 30 mL of water? Choose the closest answer.

A.

 115.027 g B.

 115.005 g C.

 115.011 g D.

 115.000 g

 

 

7.What was the combined mass of the beaker containing 2 mL of vinegar and 28 mL of water after the bubble-forming reaction with Alka Seltzer was complete? Choose the closest answer.

A.

 115.995 g B.

 119.632 g C.

 117.241 g D.

 124.184 g

 

 

8.For the beaker containing 6 mL vinegar and 24 mL water, calculate the mass lost during the Alka Seltzer reaction. Remember that you added 3 g of Alka Seltzer to the solution. Choose the closest answer.

A.

 0.883 gB.

 2.648 gC.

 1.000 gD.

 0.682 g

 

 

9.Given the mass lost during the reaction when the Alka Seltzer is the limiting reagent and that the molar mass of carbon dioxide is 44.01 g/mol, how many moles of CO₂ were produced? Choose the closest answer.

A.

 0.0192 B.

 0.0155 C.

 0.0201 mol D.

 0.0174

 

 

Question:

10.As the percent of vinegar increased, the mass of the 35 mL of liquid in the beaker (before Alka Seltzer was added) increased. What is a possible explanation for this result?

 

Correct answer:

 The density of vinegar is greater than the density of water.