Indicators are substances that change color to indicate pH levels. The pH scale measures acidity or alkalinity. Universal indicator is a mixture used to determine pH over a wide range. Acid-base titrations involve neutralizing an acid with a base or vice versa. To prepare a soluble salt, one can react an acid with an alkali, while an insoluble salt can be made by reacting two soluble reactants. Copper oxide can be prepared by heating copper carbonate or copper hydroxide.
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