Hello i had ordered a saree of rs 621 on 6th january 2018 from mirraw.com. My order no is 17419 and product ss56. I got my order on 13th january and it is entirely different from what i had ordered. So i returned back the product through professional courier with tracking number knp[protected] and it is already delivered to them.
Click for larger image. Acid and Base Indicators. Acid-Base Indicators: The most common method to get an idea about the pH of solution is to use an acid base indicator. An indicator is a large organic molecule that works somewhat like a  color dye. Whereas most dyes do not change color with the amount of acid or base present, there are many molecules, known as acid-base indicators, which do respond to a change in the hydrogen ion concentration.
Choice. Acid-base titrations often require color-changing indicators. In this titration type, an acidic solution reacts with a basic solution, and you don't know the concentration of one of them.The indicators for these titrations will change color at a certain point on the pH scale.hen you reach the endpoint of your titration, the indicator changes color. This happens because any unreacted molecules in excess of those needed to reach the endpoint reacts with the indicator molecules. This changes the structure of the indicator molecule so that its color changes.