Can someone check my answers? I've posted this a couple times and no one has responded. Is no one responding because they're all right or what?

1.) If you were involved in an acid rain monitoring project with several other samplers, why would it be important that all of you collect your samples on the same day and do the alkalinity tests within 24 hours?

Acid rain on another day may not have the same pH as the rain on that day. The pH may also decrease over time.

2.) A student did an alkalinity determination correctly, except that the sample titrated had a volume of 90.0 mL. Volume A was found to be 4.50 mL and Volume B was 7.00 mL.
a)Calculate the alkalinity value from these data and then calculate the correct value.
A=(2A-B)
A=(2(4.50-7.00)=2.0 mL^-1
A=(2(4.545)-7.07)
answer = 2.02mL^-1

b)What percent error would there be?
2.02-2.0
--------
2.02
x100

answer = .99%

c) Would there be an error in the classification of the stream? Explain concisely.

There would not have been an error in the classification. It was just a measurement error in this case.

3) EPA acidity tests can be performed by titrating a water sample to a pH of 8.2. What titrant in what concentration would you suggest for EPA acidity determinations?

The titrant I would suggest for EPA acidity determinations is sulfuric acid under a standard concentration.

And I've read it all three times. Sone of the questions I simply dn't uuderstand. For what it's worth, here goes.
1. I think your answer to #1 is poor. Probably everyone knows that the pH may/will change. Probably they also know that the pH will change over time. I think the question is asking, "WHY will the pH be different on different days and WHY will the pH decrease over time. You might address that the same amount of rain may differ on diffrerent days, that the rain front may have come from different loations of the world thus carrying different amounts of gases that causes the rain to be acid, etc. As to the alkalinity changing, WHY does it change; that is, WHY is it important to measure the alkalinity within a short time of sample collection. The answer is that the dissolved gases causing the rain to be acid have a vapor pressure and that over time they will slowly "evaporate" from the solution. Evaporate is not a good word but you can substitute a better one. You probably knew all of this but you need to spell it out, especially if this is for an assignment. If it's for general dissemination, it is even more vital to be specific.

2. I don't understand the volume A and volume B bit so I've skipped all of #2.

3. Again, I don't think you answer will cut it but it is a better answer than your #1. You were specific about using H2SO4 and that is good. I think the answer would be greatly imporoved if you specified the recommended concentration or give a range. To say "a standard concentration" will make the reader (your prof?) glance at the paper again and he/she may wonder if you know or if you are just evading the question.

I hope this helps a little although I couldn't answer all of the question.
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And my addition. I have read it three times also, and ibid on DrBob's comments. It is confusing.
On the last, my thought is IF you are titrating an acid rain water sample you need a standard base sample (NaOH), especially if you want it to get to a pH of 8. However, it is not clear to me in number three what you are trying to titrate.
The clarity of your questions makes understanding very difficult. If you ask someone something three times, and they don't answer, it is quite likely they don't understand what you are talking about. If those folks are experts, and don't understand you, well, think about that. It is part of learning the art of communication.

I.d The others are right

It seems like you are looking for someone to check your answers to a set of questions related to acid rain monitoring and alkalinity determination. However, it appears that you have not received any responses so far. There could be several reasons for this, including the complexity of the questions, lack of clarity in your answers, or simply a lack of people available to review and provide feedback.

To improve your chances of getting a response, consider the following suggestions:

1. Provide more context: Clearly explain the purpose of the acid rain monitoring project and why it is important to collect samples on the same day and perform alkalinity tests within 24 hours. This will help others understand the significance of these actions.

2. Address all aspects of the question: Make sure to fully answer all parts of each question. For example, in question 1, consider not only explaining the potential differences in pH on different days but also why the pH may decrease over time. Additionally, in question 3, specify the recommended concentration of sulfuric acid for EPA acidity determinations.

3. Use appropriate terminology: Make sure to use accurate and specific terminology related to the subject matter. This will enhance the clarity of your answers and demonstrate your understanding of the topic.

4. Seek clarification when needed: If you come across questions or concepts that you don't understand, don't hesitate to seek clarification from your instructor or classmates. This will ensure that you have a clear understanding of the material and can provide accurate answers.

5. Be patient: Sometimes it takes time for people to respond to questions, especially if they require expertise in a specific area. Give it a little more time and consider reaching out to different platforms or communities where you may find individuals who can provide the feedback you are seeking.

Remember, effective communication and clarity are key when asking for help or feedback. Taking these suggestions into consideration should improve your chances of getting the assistance you need.