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Methyl red is another pH indicator used for identifying pH values on the lower end of the scale. It appears red in pH under 4.4 and yellow over 6.2.
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Neutralization Reaction: A chemical reaction between an acid and a base which results in water and salt.
Buffer Solution: A solution that resists changes in pH when small amounts of an acid or base are added.
Acidity Constant(Ka): The equilibrium constant for an acid dissociation reaction.