High School Chemistry : Identifying Unknown Concentration

Study concepts, example questions & explanations for High School Chemistry

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Example Questions

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Example Question #471 : High School Chemistry

30mL of a solution of  of unknown concentration mixed with 19mL of   produced a solution with a pH of 7. What is the concentration of the  solution?

Possible Answers:

None of these

Correct answer:

Explanation:

For this question use the following formula: 

 is the number of acidic hydrogens on the acid,  is the molarity of the acid,  is the volume of the acid,  is the number of basic hydroxides on the base,  is the molarity of the base,  is the volume of the base

Rearrange the equation for the molarity of the base:

Plug in known values and solve.

Example Question #481 : High School Chemistry

29mL of a solution of   is mixed with 65mL of an  solution of unknown concentration produced a solution with a pH of 7. What is the concentration of the  solution?

Possible Answers:

None of these

Correct answer:

Explanation:

For this question use the following formula: 

 is the number of acidic hydrogens on the acid,  is the molarity of the acid,  is the volume of the acid,  is the number of basic hydroxides on the base,  is the molarity of the base,  is the volume of the base

Rearrange the equation for the molarity of the acid:

Plug in known values and solve.

Example Question #482 : High School Chemistry

39mL of a solution of   is mixed with 24mL of an  solution of unknown concentration produced a solution with a pH of 7. What is the concentration of the  solution?

Possible Answers:

None of these

Correct answer:

Explanation:

For this question use the following formula: 

 is the number of acidic hydrogens on the acid,  is the molarity of the acid,  is the volume of the acid,  is the number of basic hydroxides on the base,  is the molarity of the base,  is the volume of the base

Rearrange the equation for the molarity of the acid:

Plug in known values and solve.

Example Question #71 : Acid Base Chemistry

It takes 25mL of a .001M  to neutralize 5mL of a solution of  of unknown concentration. What is the concentration of the unknown solution?
Possible Answers:

None of these

Correct answer:

Explanation:

For this question use the following formula: 

 is the number of acidic hydrogens on the acid,  is the molarity of the acid,  is the volume of the acid,  is the number of basic hydroxides on the base,  is the molarity of the base,  is the volume of the base

Rearrange the equation for the molarity of the acid:

Plug in known values and solve.

Example Question #484 : High School Chemistry

It takes 35mL of .01M  to neutralize 5mL of a solution of  of unknown concentration. What is the concentration of the unknown solution?
Possible Answers:

None of these

Correct answer:

Explanation:

For this question use the following formula: 

pastedGraphic.png

pastedGraphic_1.png is the number of acidic hydrogens on the acid, pastedGraphic_2.png is the molarity of the acid, pastedGraphic_3.png is the volume of the acid, pastedGraphic_4.png is the number of basic hydroxides on the base, pastedGraphic_5.png is the molarity of the base, pastedGraphic_6.png is the volume of the base

Rearrange the equation for the molarity of the acid:

pastedGraphic_7.png

Plug in known values and solve.

pastedGraphic_8.png

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