They are cheap, rapidly produce a result that is good to about a pH unit and can simply be discarded after use. Phenolphthalein adopts at least four different states in aqueous solution as … Universal indicator is a mixture of many indicators which gives diferent colours at different pH values of entire scale. 2:30 describe the use of Universal Indicator to measure the approximate pH value of an aqueous solution | TutorMyself Chemistry. Solution. Universal indicator is a type of pH indicator that gives its color changes for a wide variety of pH values ranging from 0 to 14. It also serves as a component of universal indicator, together with methyl red, bromothymol blue, and thymol blue. The solution has a neutral pH of seven, is light green in color and is diluted in water. Universal indicator displays the entire rainbow of colors from low pH to high pH (see Figure 2). The colour of an indicator alters when the acidity or the oxidizing strength of the solution, or the concentration of a certain chemical species, reaches a critical range of values. 2. The term intermolecular forces of attraction can be used to represent all forces between molecules, 1:48 explain why the melting and boiling points of substances with simple molecular structures increase, in general, with increasing relative molecular mass, 1:49 explain why substances with giant covalent structures are solids with high melting and boiling points, 1:50 explain how the structures of diamond, graphite and C, 1:51 know that covalent compounds do not usually conduct electricity, 1:52 (Triple only) know how to represent a metallic lattice by a 2-D diagram, 1:53 (Triple only) understand metallic bonding in terms of electrostatic attractions, 1:54 (Triple only) explain typical physical properties of metals, including electrical conductivity and malleability, 1:55 (Triple only) understand why covalent compounds do not conduct electricity, 1:56 (Triple only) understand why ionic compounds conduct electricity only when molten or in aqueous solution, 1:57 (Triple only) know that anion and cation are terms used to refer to negative and positive ions respectively, 1:58 (Triple only) describe experiments to investigate electrolysis, using inert electrodes, of molten compounds (including lead(II) bromide) and aqueous solutions (including sodium chloride, dilute sulfuric acid and copper(II) sulfate) and to predict the products, 1:59 (Triple only) write ionic half-equations representing the reactions at the electrodes during electrolysis and understand why these reactions are classified as oxidation or reduction, 1:60 (Triple only) practical: investigate the electrolysis of aqueous solutions, (a) Group 1 (alkali metals) – lithium, sodium and potassium, 2:01 understand how the similarities in the reactions of lithium, sodium and potassium with water provide evidence for their recognition as a family of elements, 2:02 understand how the differences between the reactions of lithium, sodium and potassium with air and water provide evidence for the trend in reactivity in Group 1, 2:03 use knowledge of trends in Group 1 to predict the properties of other alkali metals, 2:04 (Triple only) explain the trend in reactivity in Group 1 in terms of electronic configurations, (b) Group 7 (halogens) – chlorine, bromine and iodine, 2:05 know the colours, physical states (at room temperature) and trends in physical properties of chlorine, bromine and iodine, 2:06 use knowledge of trends in Group 7 to predict the properties of other halogens, 2:07 understand how displacement reactions involving halogens and halides provide evidence for the trend in reactivity in Group 7, 2:08 (Triple only) explain the trend in reactivity in Group 7 in terms of electronic configurations, 2:09 know the approximate percentages by volume of the four most abundant gases in dry air, 2:10 understand how to determine the percentage by volume of oxygen in air using experiments involving the reactions of metals (e.g. For injection mold makers, tool and die makers and precision machinists there are essentially two types of indicators: test indicators and plunger type, or travel indicators. 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