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What are some novel ways to use indicators (besides titrations)?

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Mood lipstick. Acid-base indicators in the cosmetics change color on application due to skin pH. Turning "water" to "wine". Add phenolpthalein to a clear dilute NaOH solution.) Making real wines red. Red wines contain anthocyanins, which are pH indicators. Adjusting the pH of the wine changes its color...
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Mood lipstick. Acid-base indicators in the cosmetics change color on application due to skin pH. Turning "water" to "wine". Add phenolpthalein to a clear dilute NaOH solution.) Making real wines red. Red wines contain anthocyanins, which are pH indicators. Adjusting the pH of the wine changes its color (and its taste). Welch's grape juice works, too. Disappearing ink and invisible ink Write a message in colorless phenolthalein. Spray the paper with a dilute NaOH solution and the letters appear in pink. Demonstrating how an ion exchange column works (see the July 1996 issue of the Journal of Chemical Education for more). Food coloring Monitoring swimming pool pH. read less
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Mood lipstick. Acid-base indicators in the cosmetics change color on application due to skin pH. Turning "water" to "wine". Add phenolpthalein to a clear dilute NaOH solution.) Making real wines red. Red wines contain anthocyanins, which are pH indicators. Adjusting the pH of the wine changes its color...
read more
Mood lipstick. Acid-base indicators in the cosmetics change color on application due to skin pH. Turning "water" to "wine". Add phenolpthalein to a clear dilute NaOH solution.) Making real wines red. Red wines contain anthocyanins, which are pH indicators. Adjusting the pH of the wine changes its color (and its taste). Welch's grape juice works, too. Disappearing ink and invisible ink Write a message in colorless phenolthalein. Spray the paper with a dilute NaOH solution and the letters appear in pink. Demonstrating how an ion exchange column works (see the July 1996 issue of the Journal of Chemical Education for more). Food coloring Monitoring swimming pool pH. Soil pH kits. Demonstrating the electrolysis of water Making a "voice activated" chemical reaction. (a solution of phenol red in very slightly alkaline water will turn from red to yellow, if you talk to it for a while :) Carbon dioxide from your breath neutralizes the solution and causes the color change. read less
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they only way to improve in mathematics is practice. as you are very poor in mathematics so i will suggest you to give more time and more attention to the mathematics subject. you have to practice more so that you can remember the mathematics. to score good marks in mathematics i will suggest some way of practicing mathematics. first of all find out some chapters which are more easier to you than the others. first solve all that easy chapters. after knowing the method how to solve one particular mathematics solve so many mathematics yourself related to that, if there is any formula for the mathematics then write all the formulas of the chapter in a paper and keep the paper always in front of you. you may write all the formulas for the total syllabus in a page and may keep it in front of you. when you will be confident enough that you covered all the easy chapters then go for the other chapters. try to know the easy method to solve any mathematical problem. always try to solve mathematics yourself without taking any help. but if you fail just take help from book or any teacher and after that again solve the problem yourself. don't fear about mathematics. fear will decrease your confident. always take mathematics as easy subject. just do lots of practice. surely you will get good marks in mathematics in board examination if you study hard and give attention to the mathematics subject Source: http://entrance-exam.net/forum/general-discussion/how-score-good-marks-maths-board-exam.
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