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In another titration, a 0.500 gram sample of a weak, nonvolatile acid, HA, was dissolved in sufficient water to make 50.00 mL of solution. The solution was then titrated with the standardized NaOH solution. Predict how the calculated molar mass of HA would be affected (too high, too low, or not affected) by the following laboratory procedures. Explain each answer.
1. After rinsing the buret with distilled water, the buret is filled with the standardized NaOH solution; the weak acid HA is titrated to its equivalence point.
2. Extra water is added to the 0.500 gram sample of HA.
3. An indicator that changes color at pH 5 is used to signal the equivalence point.
4. An air bubble passes unnoticed through the tip of the buret during the titration.
1. After rinsing the buret with distilled water, the buret is filled with the standardized NaOH solution; the weak acid HA is titrated to its equivalence point.
2. Extra water is added to the 0.500 gram sample of HA.
3. An indicator that changes color at pH 5 is used to signal the equivalence point.
4. An air bubble passes unnoticed through the tip of the buret during the titration.