4. For unexplained reasons, the distilled water in a lab has a pH of about 6. A solid is added to a sample of the water and dissolves. The pH of the resulting solution is about 6. Which of the following best describes the solute?a. Soluble and dissociated to give OH-.b. Soluble and dissociated to give H3O+.c. Soluble but undissociated.d. Soluble and may or may not be dissociated. Explain your answer: 3. Gasoline is drawn from the fuel tank of an auto through an inlet tube that is attached to a float that rides on the surface of the gasoline. Which of the following characteristics of water and gasoline might account for this arrangement?a. Water is quite soluble in gasoline.b. Water is insoluble in gasoline and is more dense than gasoline.c. Water is insoluble in gasoline and is less dense than gasoline.Explain your answer:

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Asked Mar 28, 2019
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4. For unexplained reasons, the distilled water in a lab has a pH of about 6. A solid is added to a sample of the water and dissolves. The pH of the resulting solution is about 6. Which of the following best describes the solute?

a. Soluble and dissociated to give OH-.
b. Soluble and dissociated to give H3O+.
c. Soluble but undissociated.
d. Soluble and may or may not be dissociated.
 
Explain your answer:
 

3. Gasoline is drawn from the fuel tank of an auto through an inlet tube that is attached to a float that rides on the surface of the gasoline. Which of the following characteristics of water and gasoline might account for this arrangement?

a. Water is quite soluble in gasoline.
b. Water is insoluble in gasoline and is more dense than gasoline.
c. Water is insoluble in gasoline and is less dense than gasoline.

Explain your answer:

 

 

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Expert Answer

Step 1

4) Given that the pH do not change after the addition of NaOH.

 

Since the pH remains unchanged, when solid is dissolved in water, so it may neither have OH nor H3O- ions formed as the product.

Step 2

This indicates that solid do not contain hydroxide or hydrogen ions, or the substance added do not dissociate into ions to make changes in pH.

 

Consider an example of C12H22O11 and NaCl, both are soluble. Sucrose does not dissociate but NaCl dissociate and do not contain H+ or OH- ions.

The best statement is Option d: “Soluble and may or may not be dissociated”.

Step 3

3) Water floats on the surface of gasoline.

 

Gasoline is non polar hydrocarbon.

 

Only like dissolves like, so water being a polar solvent is insoluble in gasoline. Volume of the gasoline is higher as compared...

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