| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Ag8n | "The data shows that natural titration indicators with long shelf life (90 days) do exist ( see the Hippeastrum note above). However, Red cabbage d..." | Read more » | over 1 year ago | |||
| Ag8n | "The research shows that natural titration indicators, with good shelf life, do exist ( see Hippeastrum, above). However, Red cabbage does not appe..." | Read more » | over 1 year ago | |||
| Ag8n | "The acid (from the pH 3 solution ) for the cabbage indicator could mess up some titrations. A blank might need run(and, depending on the titration..." | Read more » | over 1 year ago | |||
| Ag8n | "Clarification. Acidic media is pH 3. " | Read more » | over 1 year ago | |||
| Ag8n | "Check this reference: "Evaluation of red cabbage dye as a potential natural color for pharmaceutical use" by Neela Chigurupati, et. al. Industrial..." | Read more » | over 1 year ago | |||
| Ag8n | "Some natural indicators can have shelf lives of up to 90 days in solution. See "Hippeastrum hybridum anthrocyanin indicators of acid - base titrat..." | Read more » | over 1 year ago | |||
| Ag8n | "Interesting paper on this same subject. " Application of Butterfly Pea extract as an indicator of acid - base titrations " by Nyi Mekar Saptarini ..." | Read more » | over 1 year ago | |||
| hunternick363 | "This is a nice and simple method of measuring the PH of a solution. I remember these kinds of experiments we used to do in science class. We have t..." | Read more » | over 1 year ago | |||
| stevejohnson | "thanks for the information " | Read more » | over 1 year ago | |||
| Ag8n | "For a couple other reads, look up "The Effect of pH on Color Behaviour of Brassica oleracea Anthocyanin" in Journal of Applied Sciencies, volume 11..." | Read more » | over 1 year ago | |||
| bhamster | "I did this! We tested vinegar, baking soda, lemon juice, pickle juice, and carbonated water. A lot of acids easily available in the kitchen. Then w..." | Read more » | over 1 year ago | |||
| alejobonifacio | "Hi @Ag8n! Thanks for your reply! I had this cabbage solution in fridge almost a week and I didn't see an appreciable color change. I don't know if ..." | Read more » | over 1 year ago | |||
| Ag8n | "First, I'd like to thank Alejo for posting this page. It is very helpful. Then, I' d like to refer you to the comments page in compound chem ( da..." | Read more » | over 1 year ago | |||
| alejobonifacio | "Glad to hear that @bhamster! Comming soon the english version of the activity ;) Yes, there are some research papers that used this natural pigment..." | Read more » | over 1 year ago | |||
| bhamster | "This is so cool, @alejobonifacio, I had no idea about this cabbage capability! Do you know of any examples where this pH detection method has been ..." | Read more » | over 1 year ago | |||
| DrJohnBarrett | "I have more sophisticated instruments for water quality testing, if needed.. " | Read more » | almost 5 years ago | |||
| stevie | "Also, we split up the kit before the workshop. We had the students divide into groups and rotate through the testing, so everyone was able to get h..." | Read more » | about 5 years ago | |||
| stevie | "Here's the page we put together to make a worksheet for students. It's from the materials in the book, but since we were doing this with 10 or so s..." | Read more » | about 5 years ago | |||
| WaterGeek | "Nice work. That Arduino sketch (.ino) available? " | Read more » | over 5 years ago | |||
| incaking | "/* Ph And Temperature Sensing Sample Code * ph meter sensor data reading * real time temperature monitoring Hardware List * 18B20 temperature s..." | Read more » | over 5 years ago | |||
| shanlter | "@shanlter awards a barnstar to incaking for their awesome contribution! " | Read more » | over 5 years ago | |||
| shanlter | "thanks! @incaking!!! 非常详细的说明文档~！ 你可以把arduino的程序链接也上传一下吗？ " | Read more » | over 5 years ago | |||
| warren | "Hi, this looks awesome! Do you have a link to the Arduino sketch (.ino) file you've used? " | Read more » | over 5 years ago |