universal indicators

A mixture of several indicators with a wide range of pH is an universal indicator. These are obtained by mixing certain indicators that behave like a single indicator. The changes in colour may occur over a considerable portion of the pH range..

A mixture of several indicators with a wide range of pH is an universal indicator. These are obtained by mixing certain indicators that behave like a single indicator. The changes in colour may occur over a considerable portion of the pH range. Thes..

Universe consists of all matter and all light and other forms of radiation and energy. It consists of everything that exists anywhere in space and time. The universe includes the earth, everything on the earth and within it and everything in the solar system. All stars, includin..

Indicators are the chemicals that when added to solutions show whether the solution is acidic or basic, by a sudden change of their colour. The common indicators used and the colour changes observed are mentioned belo..

Bromothymol blue 6.0 - 7.6 Yellow Blue Phenol red 6.4 - 8.2 Yellow Red Thymol blue (base) 8.1 - 9.6 Yellow Blue Phenolphthalein 8.3 - 10.0 Colourless Blue Thymolphthalein 8.3 - 10.5 Colourless Blue Alizarin yellow R 10.1 - 12.0 Blue Yellow Nitramine 10.8 - 1..

The core consists of two parts: the inner core and outer core. The outer core begins about 2,900 kilometers below the earth's surface. Scientists believe that the outer core is about 2,250 kilometers thick and is made of melted iron and nickel. The temperature of the outer core ranges from about 45..

="col">Reactivity and Reactions Potassium K Very reactive, very rapid with cold water forming the alkah potassium hydroxide and hydrogen gas (which is ignited). 2K + 2H 2 O (l) -------> 2KOH (aq) + H 2 (g) Sodium Na Fast reaction with cold water forming the alkali sodium hydroxide and hydrogen g..

>The conical envelope represents a very narrow region of high pressure called the 'shockwave'. Some examples of the formation of the shockwaves are when (i) a supersonic aircraft flies across the sky (ii) a bullet is shot from a gun. A shockwave is a highly concentrated sound wave and is therefore,..

The reaction of sodium with water-the sodium melts to a silvery ball and fizzes as it spins over the water. The rapid exothermic reaction produces a colourless gas that gives a squeaky pop! with a lit splint-hydrogen. Universal indicator will turn from green to purple/violet-the ..