15. A 10-mL sample of tartaric acid ( ) is titrated to a phenolphthalein endpoint with 20. mL of 1.0 M NaOH. What is the molarity of the acid? (A) 0.5 (B) 1.0 (C) 2.0 (D) 4.0 (E) impossible to determine
15. A 10-mL sample of tartaric acid ( ) ..-阿摩線上測驗
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) is titrated to a phenolphthalein endpoint with 20. mL of 1.0 M NaOH. What is the molarity of the acid? 
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