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.
The pH scale. It is possible to tell if a solution is acidic or alkaline by using an indicator. An indicator is a substance which has different colours when it is in acidic or alkaline conditions. Litmus is probably the most well-known indicator. This is red in acids and blue in alkalis. Litmus can be used as a liquid, or as litmus paper. Solutions of acids and alkalis can vary widely in their acidity and alkalinity. It is useful to know not just whether a solution is an acid or an alkali, but how acidic or how alkaline it is. To measure acidity and alkalinity, we can use the pH scale. The easiest way to do this is to use Universal indicator. This is a mixture of several different indicators, and can be used as a liquid or paper. It has many different colour changes. The colour of the Universal indicator shows the pH value of the solution.