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Define the following terms: 
(a) Standard solution (b) Normal solution (c) Indicator 

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A. In analytical chemistry, a standard solution is a solution containing a precisely known concentration of an element or a substance. 
B. Normal solution is a solution made by dissolving 1 gram equivalent weight of a substance in distilled water to make 1 L of the solution. 
C. A substance that indicates whether a solution is acidic, basic, or neutral by usually a color change is termed as an indicator. Methyl orange is an indicator that is reddish-orange in an acidic medium, and in the basic medium, it turns yellow.  

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