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com www.GOALias.blogspot.com www.GOALias ... - fun learning

com www.GOALias.blogspot.com www.GOALias ... - fun learning

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<strong>www</strong>.<strong>GOALias</strong>.<strong>blogspot</strong>.<strong>com</strong>Name of acidAcetic acidFormic acidCitric acidLactic acidOxalic acidAscorbic acid(Vitamin C)Tartaric acidDo you know?Found inVinegarAnt’s stingCitrus fruits suchas oranges,lemons, etc.CurdSpinachAmla, Citrus fruitsTamarind, grapes,unripe mangoes, etc.All the acids mentionedabove occur in natureName of baseFound inCalcium hydroxideLime waterAmmonium hydroxide Window cleanerSodium hydroxide/ SoapPotassium hydroxideMagnesium hydroxide Milk of magnesia5.25.2 NATURALINDICATORSAROUND USLitmus: A natural dyeThe most <strong>com</strong>monly used naturalindicator is litmus. It is extractedfrom lichens (Fig. 5.1). It has amauve (purple) colour in distilledwater. When added to an acidicsolution, it turns red and whenadded to a basic solution, it turnsblue. It is available in the form of asolution, or in the form of strips ofpaper, known as litmus paper.Generally, it is available as red andblue litmus paper (Fig. 5.1).(a)Can I taste all substances tofind their taste?No. Have you not read thecaution? We should nottaste unknownsubstances. They couldharm us.(b)Fig. 5.1 (a) Lichens, and (b) Red and bluelitmus paper50SCIENCE

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