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The indicator phenolphthalein changes from colorless to pink between pH

The indicator phenolphthalein changes from colorless to pink between pH

The indicator phenolphthalein changes from colorless to pink between pH 8.2 and pH 10.  If phenolphthalein is added to a solution, and the solution remains colorless, then

A)the solution is acidic, and the pH must be at or below 7.0.

B)the pH of the solution must be below 8.2, and the solution is basic.

C)the pH of the solution must be below 8.2, but the solution could be either acidic or basic.

D)the pH of the solution must be above 10, and the solution is basic.

E)the pH of the solution is above 10, and the solution is acidic.

 

113.              The indicator phenol red changes from yellow to red between pH 6.8 and pH 8.4.  If phenol red is added to a solution, and the solution turns yellow, then

A)the solution is basic, and the pH must be at or below 7.0.

B)the pH of the solution must be below 6.8, and the solution is basic.

C)the pH of the solution must be below 6.8, and the solution is acidic.

D)the pH of the solution must be above 8.4, and the solution is basic.

E)the pH of the solution is above 8.4, and the solution is acidic.

 

114.              The indicator phenol red changes from yellow to red between pH 6.8 and pH 8.4.  If phenol red is added to a solution, and the solution turns red, then

A)the solution is basic, and the pH must be at or below 7.0.

B)the pH of the solution must be below 6.8, and the solution is basic.

C)the pH of the solution must be below 6.8, and the solution is acidic.

D)the pH of the solution must be above 8.4, and the solution is basic.

E)the pH of the solution is above 8.4, and the solution is acidic.

 

115.              If CH3NH2 is added to water, what other compound could also be added in order to make a buffered solution?

A)H2OD)NaCH3NH2

B)NaOHE)none of these is correct

C)CH3NH3Cl

 

116.              If Na2HPO4 is added to water, what other compound could also be added in order to make a buffered solution?

A)H3PO4D)Na2PO3

B)NaHPO4E)none of these is correct

C)NaH2PO4

 

117.              If NaH2PO4 is added to water, what other compound or compounds could also be added in order to make a buffered solution?

A)H3POonlyD)Na2POonly

B)NaHPOonlyE)either H3PO4 or Na2HPO4

C)Na2HPOonly

 

118.              A solution of a strong acid will have a greater H3O+ concentration than a solution of a weak acid under any circumstances.

 

119.              Polyprotic acids possess more than one ionizable hydrogen.

 

120.              In polyprotic acids, the first ionizable hydrogen always ionizes to a greater extent than the second or third ionizable hydrogen(s).

abhinav behal 15-Feb-2020

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