chemistry help

[jr1968]

I have too questions that I am having a problem with and I am wondering if someone could help me.

What ion is in excess in acidic acid solutions?

1. Cl-

   
   

2. H3O+

   
   

3. OH-

   
   

4. Hydroxide

   
   

5. hydrogen gas

   
   

A buffer functions to

1. maintain a pH of 7.0

   
   

2. maintain a neutral pH

   
   

3. maintain a fairly constant pH

   
   

4. decrease chances for survival

   
   

5. dilutes bases

   
   

The answers that I chose was b for the first question and c for the second one.

Oh, one more thing I am having a problem writing a pH for a solution with a hydrogen ion concentrating of 3.7 x 10-5

[SnowStar4]

You are correct, b and c.

Why don't you guess the pH and I will tell you if you are correct?

[AgentBeast, BSN, RN]

Your first 2 answers are correct.

pH is equal to the negative log of the hydrogen ion concentration of a solution. I'm not going to do the math for you though.

[jr1968]

I came up with 4.43 log(3.7*10-5)=4.43

[SnowStar4]

Good job. That's what I would put too.

[ebear, BSN, RN]

I agree.

[jr1968]

How about these questions are these right?

What is the correct conjugate base for H3PO4?

1. PO4-3
   
2. H2PO4-
   
3. Phosphate
   
4. HPO4-2
   
5. Cl-
   

I chose number 2

what formula defines pH?

1. log(H+)
   
2. log(OH-)
   
3. -log(H+)
   
4. -log(OH-)
   
5. none of the above
   

I chose 3

What ion is produced in basic or alkaline solutions?

1. hydroxide
   
2. OH-
   
3. Hydrogen
   
4. both a&b are correct
   
5. none of the above
   

I chose 4

If a solution has a pH of 3.5, which statement is true?

1. the solution is acidic
   
2. the solution is basic
   
3. the solution has excess hydroxide ions
   
4. both b&c are correct
   
5. you could never drink a solution with a pH of 3.5
   

I chose 1

[SnowStar4]

Looks like you don't really need our help! I would agree with all your answers.

[Moogie]

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