More

PH Scale

WOW! I love how you have provided some questions to test the reader's knowledge of the material (Very creative!). There are a few ".jpeg" images in your module that should be removed in order to create more clarity in your explanation. It is somewhat odd that you only have one source for your module so I would recommend finding other sources that could broaden your viewpoint on the topic and aid in giving better clarity on the topic. An example is how you forgot to mention that each unit on the pH scale increases by a factor of 10. Maybe that could be another question you could ask and that topic could be used to expand your introduction. You also fail to mention what Kw means. I think with more in depth explanations of the terms used you module will be amazing. I would recommend Segels book "Biochemistry calculations" as a reference to better explain some of the topics covered here.

Viewing 7 of 7 comments: view all
Nahda Harati

Synopsis: The pH scale is a scale used to measure the amount of acid or base in a solution and determines molarity of hydrogen ions and hydroxide ions. The total of pH and pOH must be 14, with a neutral state at 7 and above being basic 7 and below being.

Keywords: The keywords were: pH scale (bing), acid and bases (google), concentration of acids and bases (google)

Review: Your module is very clear and well formatted. I understood all your explanations clearly without any need to look up additional information. I really liked how you incorporated examples after a few of your topics; viewing how you solved them helped me understand the topic better. Also the incorporation of equations at the end of the module was a great way to conclude and remind the reader that those equations are important.
Under the pH and pOH topic you say, "the constant of water determines the range of the pH scale." I didn't quite understand what you meant by that. What is the constant of water? The neutral 7?
One thing I thought you could add to your module to help clarify would be a visual after the text when you explain how to read a pH scale. If you could create a visual with arrows pointing to areas on the scale and stating what is in that given area, that you really simplify that topic and make it a lot easier to understand. Other than that I found a few grammar and spelling mistakes so I fixed those.
Good Job! edited 12:00, 4 Dec 2009
Posted 11:53, 2 Dec 2009
Son Nguyen

Synopsis: The pH scale measure how acidic or basic a solution is, the range of the pH scale is from 1-14; if anything is above a 7 that solution is basic anything below a 7 will be acidic so 7 is the neutral state. It can also help determine the concentration and molarity of hydrogen. pOH is the measure of basic solution while pH+ measure the acidic and the addition of these two will always lead up to 14.

2) acid and basic solution (Google)
3) self ionization of water (Google)

Review Details: Overall you did a great job i like the way you set up the stages of the module. One suggestion i can give you for this is for the self ionization water, i don't really get equation so maybe use this one 2 H2O (l) --> H3O+ (aq) + OH− (aq) which i found it to be more simpler. Even though there are a few grammatical errors the text was easy to understand edited 23:54, 2 Dec 2009
Posted 23:53, 2 Dec 2009
Lynn Park

Synopsis: A pH scale measures how acidic or basic a substance or solution is. The lower the number, the more acidic the solution is and the higher concentration of hydrogen ion it has. Likewise, if the higher the number, the more basic it is and the higher concentration of hydroxide ion it has. The range of the pH scale is 1 – 14, 7 is the neutral state.

Review: I really liked how you kept everything very simple but did not forget to mention any important information. I really liked the little figure in the introduction which provides what kind of fruits are acidic or basic and such... However, overall you did a very good job and if I had to mention what you could add more, maybe an informative video that explores more in depth in your topic? great job I liked it.
Posted 00:50, 5 Dec 2009
1. Synopsis: pH refers to the concentration of hydrogen ions in a solution. The pH scale is a logarithmic scale ranging from 1 to 14, where values ranging from 7 to 0 are increasingly acidic. Due to an increase in acidity, these solutions are known to have greater hydrogen ion concentrations. Likewise, solutions with a pH ranging from 7 to 14 are increasingly basic. These solutions have an increasingly greater concentration of hydroxide ions. A solution with a pH of 7, the middle value on the pH scale, is said to be neutral. It is neither acidic or basic.
2. The module seems well organized and there were no misspellings that I noticed. I may combine the figures and information from the “range of pH” and “reading a pH scale” sections since the information seemed a little repetitive.
3. Figures
I found the figures to be helpful and accurate. The figures aren’t labeled with numbers, but it seems apparent which figure is being referenced to due to their placement under each subsection. As commented earlier, I might try to find a way to merge both the figures and information from the “range of pH” and “reading a pH scale” together.
It also might be helpful to include a few brief sentences on how to make logarithmic graphs. A basic sketch on how to create a graph may be useful.

Tables
The tables were helpful and a nice touch in demonstrating the differences between theoretical and experimentally determined pH. My only suggestion would be to number the tables so they’re clearly marked for the reader.

Text
Everything looked good from what I saw. I didn’t notice any grammar of spelling errors.

4. I reworded part of the introduction since I found it slightly confusing.

The pH scale is based on a logarithmic scale, meaning that an increase or decrease of an integer value changes the concentration by a tenfold. For example, a pH of 3 is ten times more acidic than a pH of 4. Likewise, a pH of 3 is one hundred times more acidic than a pH of 5. Similarly a pH of 11 is ten times more basic than a pH of 10.
5. I checked for plagiarism using the suggested sites and the article looks to be an original work.
6. I used the advised site and the images seems to be okay to use.
Posted 19:18, 27 Nov 2010
1. Synopsis: The pH scale measures how acidic/basic a solution is. Likewise, pH refers to the concentration of hydrogen ions in a certain solution. This scale is a logarithmic scale (each increment is increased/decreased by a tenfold) generally ranging from 0 to 14 (no true upper or lower bound). A pH value of 0-7 would be considered acidic (greater concentration of hydrogen ions). A pH value of 7 would be considered neutral. And a pH value of 7-14 would be considered basic (greater concentration of hydroxide ions). These measurements are generally used in chemistry, biochemistry, and biology.

2. Ready? There were no true mistakes in this module. (No evident mispellings, grammatical errors, everything seems accurate).

3. Review Details: First off, the introduction is either split up or the true introduction is not labeled (Minor thing). There were a few topics that seemed like they were jumping around the module. I think the "reading..." and "range..." should be placed together. That would make the organization better. Other than that, no real issues at all. I think the visuals were very helpful. I also like the explanations of the examples.

(Fixed mistake)
- I also added Introduction as a link for the outline (hopefully that is alright).

Plagiarism Check: (Checked)

Figure Check: (Pass) edited 23:26, 28 Nov 2010
Posted 23:26, 28 Nov 2010
Reviewer: Allison Langius

1. Synopsis: Measuring the acidity or basicity of a substance is shown through the pH scale. It is a logarithmic scale. Water can act as an acid or a base and the self-ionization of water is when hydronium and hydroxide ions are formed from two water molecules. Equilibrium of water shifts when an acid and a base are added. pH refers to the potential of hydrogen ion. pH ranges from 0-14. 0 is most acidic, and 14 is most basic.

2. The module does seems like it is ready to go to Vet2 level, but I found a couple spelling errors. It is organized pretty well.

3. Review Details; The figures all correlated very well with the information in the text. They aren’t labelled with numbers however. The reading the pH scale figure was very helpful and well made. Good job!

4. Changed theromodynamic to thermodynamic, If to is.

5. Passed the Plagiarism Check.

6. None of the figures were found.
Posted 00:56, 29 Nov 2010
Great module! Everything is organized and well-explained. I'd give more details on some of the topics, but otherwise, very good!
Posted 16:31, 4 Jun 2011
Viewing 7 of 7 comments: view all