(a) What is an indicator? Name three common indicators.(b) Name the acid-base indicator extracted from lichen.(c) What colour does the turmeric paper turn when put in an alkaline solution? (2024)
Hint:A substance will be known as an acid if it gives out hydrogen ions that is ${H^ + }$ ions when dissolved in water. A substance will be known as a base if it gives out hydroxide ions that is $O{H^ - }$ ions when dissolved in water. In order to find whether a solution is acidic or basic, indicators are used.
Complete answer: (a) Indicator is a substance which changes its colour when it comes in contact with an acid or a base. An acidic substance is a substance which includes acid within itself. A basic substance is a substance which includes base within itself. An indicator is used to differentiate between an acidic substance and a basic substance. There is a range of different indicators. Among all, the common indicators are as follows; litmus, china rose, turmeric and phenolphthalein. (b) The acid-base indicator which is extracted from lichen is litmus. Litmus can be used as a litmus solution or litmus paper. (c) The colour of turmeric paper is yellow. When put in an alkaline or basic solution, the turmeric paper changes its colour to red. The turmeric paper does not change its colour when put in an acidic solution.
Note: Indicators are subdivided into two types which are as follows; natural indicators and synthetic indicators. The examples of natural indicators are litmus, china rose and turmeric. The example of a synthetic indicator is phenolphthalein.
Among all, the common indicators are as follows; litmus
litmus
Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue.
, china rose, turmeric and phenolphthalein. (b) The acid-base indicator which is extracted from lichen is litmus. Litmus can be used as a litmus solution or litmus paper. (c) The colour of turmeric paper is yellow.
(a) An indicator is a 'dye' that changes colour when it is put in an acid or a base. The three most common indicators are: Litmus, Methyl orange and Phenolphthalein. (b) The acid-base indicator extracted from lichen is Litmus. (c) Turmeric paper turns red when put in an alkaline solution.
Litmus, phenolphthalein and methyl orange are the common acid-base indicators. Basically these are organic dyes with characteristic colours. Litmus is the extract of the plant lichen. Phenolphthalein and methyl orange are synthesised in the laboratory.
Indicators are substances that change colour when they are added to acidic or alkaline solutions. Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory. Change in property is observed when they come in contact with an acidic or basic solution.
An indicator is used to differentiate between an acidic substance and a basic substance. There is a range of different indicators. Among all, the common indicators are as follows; litmus, china rose, turmeric and phenolphthalein. (b) The acid-base indicator which is extracted from lichen is litmus.
In this report, “hunger” refers to the index based on the four component indicators (undernourishment, child stunt- ing, child wasting, and child mortality). Taken together, the component indicators reflect deficiencies in calories as well as in micronutrients.
Turmeric is an acid base indicator, which changes colour when the solution turns acidic or basic. Turmeric contains a chemical called curcumin, which remains yellow in an acidic or neutral solution, but turns red in a base.
Big 3 combines Taylor's checklists and favorite indicators to create the Big 3 signals. Big 3 stands for Trend, Structure, and Momentum. Criteria that when met can lead to powerful directional moves.
An indicator is a measurement or value that gives you an idea of what something is like. ... vital economic indicators, such as inflation, growth and the trade gap. Synonyms: sign, mark, measure, guide More Synonyms of indicator.
Biological indicators or bioindicators are living organisms (microbes, animals and plants) that are used as a potential tool to monitor the changes (either positive or negative) in environmental health and their possible impact on human civilization (Azzazy, 2020).
Some examples of natural indicators are turmeric, grape juice, red cabbage, cherries, onion, beetroot etc. Synthetic indicators are indicators which are synthesized in the laboratory. Examples of synthetic indicators include phenolphthalein, methyl orange etc. litmus paper is also an example of synthetic indicator.
Artificial and Natural indicators are the main two types of Chemical indicators. Another type of indicator includes Olfactory indicators. Litmus, red cabbage, turmeric, china rose are a number of the present indicators around us.
Litmus is perhaps the best-known pH indicator. Thymol Blue, Phenol Red, and Methyl Orange are all common acid-base indicators. Red cabbage can also be used as an acid-base indicator.
For example, common indicators such as phenolphthalein, methyl red, and bromothymol blue are used to indicate pH ranges of about 8 to 10, 4.5 to 6, and 6 to 7.5 accordingly. On these ranges, phenolphthalein goes from colorless to pink, methyl red goes from red to yellow, and bromothymol blue goes from yellow to blue.
a A common acid base indicator and a universal indicator: Acid base indicator like litmus tells us only whether a given substance is an acid or a base.Universal indicator gives an idea as to how acidic or basic a substance is. An universal indicator gives different colours with solutions of different p H values.
Hobby: Gunsmithing, Embroidery, Parkour, Kitesurfing, Rock climbing, Sand art, Beekeeping
Introduction: My name is Roderick King, I am a cute, splendid, excited, perfect, gentle, funny, vivacious person who loves writing and wants to share my knowledge and understanding with you.
We notice you're using an ad blocker
Without advertising income, we can't keep making this site awesome for you.