Call Now to Set Up Tutoring:

(888) 888-0446

College Chemistry : pH

Study concepts, example questions & explanations for College Chemistry

Create An Account

All College Chemistry Resources

1 Diagnostic Test 100 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #1 : P H

Determine the pH of a solution that is $0.40M \text{HCl}$ .

Possible Answers:

0.22

0.39

1.42

0.40

Correct answer:

0.40

Explanation:

Since $\text{HCl}$ is a strong acid, the concentration of H_3O^+ is equal to the concentration of the acid itself.

Thus, [H_3O^+]=0.40M .

Recall how to find the pH of a solution:

$\text{pH}=-\log([H_3O^+])$

Plug in the given hydronium ion concentration to find the pH of the given solution.

$\text{pH}=-\log(0.40)=0.40$

Remember to maintain the correct number of significant figures.

Report an Error

Example Question #2 : P H

Find the pH for a solution that is $0.520\%$ HBr by mass. Assume a density of $1.01\frac{g}{mL}$ for the solution.

Possible Answers:

1.233

3.007

2.001

1.188

Correct answer:

1.188

Explanation:

Start by assuming that there is liter of the solution. From this, we can use the given density to find the mass of the solution.

$\text{Mass of solution}=1000\text{mL of Solution} \cdot \frac{1.01g}{mL}=1010\text{g of solution}$

Next, find the mass of $\text{HBr}$ that is present in the solution.

$\text{Mass of HBr}=0.00520(1010g)=5.252\text{g of HBr}$

Now, find the number of moles of $\text{HBr}$ that is present in the solution.

$5.252\text{g HBr}\frac{1\text{mol HBr}}{80.91\text{g HBr}}=0.06491\text{moles of HBr}$

Since we initially assumed that we had liter of the solution, we now also know the concentration of $\text{HBr}$ in this solution.

$[\text{HBr}]=0.06491M$

Since $\text{HBr}$ is a strong acid, the concentration of hydronium ions in the solution will be the same as the concentration of $\text{HBr}$ .

$[\text{HBr}]=[H_3O^+]=0.06491M$

Recall how to find the pH of a solution.

$\text{pH}=-\log([H_3O^+])$

$\text{pH}=-\log(0.06491)=1.188$

Report an Error

Example Question #1 : P H

Find the pH of a solution that is $5.06\% \text{HI}$ by mass. Assume a density of $1.01\frac{g}{mL}$ for the solution.

Possible Answers:

0.211

0.398

0.336

0.451

Correct answer:

0.398

Explanation:

Start by assuming that there is liter of the solution. From this, we can use the given density to find the mass of the solution.

$\text{Mass of solution}=1000\text{mL of Solution} \cdot \frac{1.01g}{mL}=1010\text{g of solution}$

Next, find the mass of $\text{HI}$ that is present in the solution.

$\text{Mass of HI}=0.0506(1010g)=51.106\text{g of HI}$

Now, find the number of moles of $\text{HI}$ that is present in the solution.

$51.106\text{g HI}\frac{1\text{mol HI}}{127.91\text{g HI}}=0.3995\text{ moles of HI}$

Since we initially assumed that we had liter of the solution, we now also know the concentration of $\text{HI}$ in this solution.

$[\text{HI}]=0.3995M$

Since $\text{HI}$ is a strong acid, the concentration of hydronium ions in the solution will be the same as the concentration of $\text{HI}$ .

$[\text{HI}]=[H_3O^+]=0.3995M$

Recall how to find the pH of a solution.

$\text{pH}=-\log([H_3O^+])$

$\text{pH}=-\log(0.3995)=0.398$

Report an Error

Example Question #1 : P H

Which of the following techniques will decrease the pH of a solution?

Possible Answers:

Increasing the amount of Hydroxide molecules

Decreasing the concentration of protons

Adding more acid at the same Molarity of the solution

Increasing the amount of solvent

Increasing the concentration of protons

Correct answer:

Increasing the concentration of protons

Explanation:

Increasing the concentration of protons of a solution will make the solution more acidic; therefore, it lowers the solution’s pH. Decreasing the concentration of protons will make the solution more basic, raising the pH. Adding more acid of the same molarity of the original solution will not increase the concentration of protons and will not increase acidity or lower the pH. Increasing the amount of hydroxide ions will make the solution more basic and raise the pH. Increasing the amount of solvent will lower the concentration, affecting molarity and not lowering the pH.

Report an Error

View Tutors

Sydney
Certified Tutor

University of Vermont, Bachelor of Science, Nursing (RN). University of Connecticut, Bachelor of Science, Health Sciences, Ge...

View Tutors

Etta
Certified Tutor

CUNY Queens College, Bachelors, English.

View Tutors

Margaret
Certified Tutor

Smith College, Bachelor of Science, Biological and Physical Sciences.

All College Chemistry Resources

1 Diagnostic Test 100 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

Math Tutors in San Francisco-Bay Area, GRE Tutors in San Diego, SSAT Tutors in Chicago, Computer Science Tutors in Washington DC, Algebra Tutors in Denver, SSAT Tutors in Atlanta, ISEE Tutors in Phoenix, LSAT Tutors in San Francisco-Bay Area, Math Tutors in Chicago, Computer Science Tutors in Denver

Popular Courses & Classes

SSAT Courses & Classes in San Diego, SAT Courses & Classes in Miami, SSAT Courses & Classes in Seattle, ACT Courses & Classes in Dallas Fort Worth, GRE Courses & Classes in San Francisco-Bay Area, LSAT Courses & Classes in Denver, ACT Courses & Classes in Phoenix, MCAT Courses & Classes in Los Angeles, ACT Courses & Classes in Los Angeles, ISEE Courses & Classes in New York City

Popular Test Prep

ISEE Test Prep in Philadelphia, GRE Test Prep in San Francisco-Bay Area, MCAT Test Prep in New York City, SSAT Test Prep in Phoenix, SAT Test Prep in Los Angeles, ACT Test Prep in Los Angeles, SAT Test Prep in San Diego, ACT Test Prep in Dallas Fort Worth, ISEE Test Prep in New York City, SAT Test Prep in Dallas Fort Worth

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

College Chemistry : pH

Study concepts, example questions & explanations for College Chemistry

All College Chemistry Resources

Example Questions

Example Question #1 : P H

Example Question #2 : P H

Example Question #1 : P H

Example Question #1 : P H

All College Chemistry Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: