12. If a solution buffered with lactic acid (pK = 3.9) has a pH of 4.2, what is the fraction of the lactic acid is in the conjugate base form? 13. What is the pOH of a solution of 0.5 mM HCI?

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A:

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Q: How many chiral centers are present in the molecule below ОН A.7 B. 5 С.6 D.8 Н Н Н

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A: Detail solution is given below

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Q: H₂N- -NH₂

A: e teh

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.