THIS DAY IN SCIENCE: Bali Tiger Is Extinct in 1937

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This quick demonstration is a highly visual illustration of the use of acid-base indicators to determine pH. Milk of magnesia is mostly a suspension of magnesium hydroxide in water. Magnesium hydroxide is a strong base that readily neutralizes hydrochloric acid. Universal indicator is a mixture of several acid-base indicators. The changing colours of the indicator during this reaction help students to observe the pH changes that occur during neutralization.

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