Phenolphthalein is a weak organic acid, being colorless in an acidic solution and pink ( because of the color of its conjugate base) in a base solution. The Experimental Procedure suggests the addition of 2 drops of phenolphthalein for the standardization of the sodium hydroxide solution. Explain why the analysis will be less accurate with the addition of a larger amount, e.g., 20 drops, of phenolphthalein.
2006-12-01
14:03:41
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6 answers
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ZG786
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Science & Mathematics
➔ Chemistry