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Unformatted text preview: mL of H 2 SO 4 solution. What is the concentration of H 2 SO 4 solution? 2 NaOH + H 2 SO 4 Na 2 SO 4 + 2 H 2 O How do we know when the reaction is complete? We add a tiny amount of indicator to the analyte that will change color when the solution has excess titrant (e.g. excess OH-). For example, phenolphthalein molecules are colorless in neutral and acidic solutions, but are reddish purple in basic ( i.e. , excess OH-) solutions. Indicator: A material which (by changing colors or other means) signals that the equivalence point has been attained. End Point: When the indicator indicates that the equivalence point have been reached ( e.g. , changes color). Indicators need to be chosen carefully, so they don't change color too soon or too late....
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