malarial drug. Using the sigma frameworks given below, draw three new resonance forms for chloroquine. Be sure to keep track of formal charges. Electron-motion arrows are not HN required. It would be prudent to identify lone pairs of electrons that can be involved in resonance. CI N. Chloroquine HN HN CI N. CI 'N' HN CI N'

Q: H+ + CH,CH,–OH

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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.