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Indicators and pH

Indicators and pH. Chemical substances called indicators are used to determine if a substance is an acid or a base. Indicators are substances which change colour according to the pH of a solution. The pH or haupū of a substance indicates how acidic it is. The pH scale ranges from

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Indicators and pH

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  1. Indicators and pH Chemical substances called indicators are used to determine if a substance is an acid or a base. Indicators are substances whichchange colour according to thepHof a solution. ThepHorhaupūof a substance indicates how acidic it is. The pH scale ranges from 0 (highly acidic) to 14 (highly basic).

  2. pH scale ∙ ĀwhatapH The pH scale indicates the presence of H+ (hydrogen ions) and OH- (hydroxide ions) Weak/ dilute bases: Produce small amounts of OH- Strong/ concentrated acids: Produce large amounts of H+ Weak/ dilute acids: Produce small amounts of H+ Strong/ concentrated bases: Produce large amounts of OH-

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