2. Write the molecular equation for the reaction that occurs between potassium hydroxide and hydrobromic acid. 3. Calculate the molar concentration, in mol/L, of the aqueous potassium hydroxide.

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A student used 9.925 x 10-2 mol/L hydrobromic acid to standardize an aqueous solution of potassium hydroxide and
obtained the following titration data using phenolphthalein as an indicator:
Concentration of HBr used: 9.925 x 10-2 mol/L
Volume of HBr used: 25.00 mL
Indicator: phenolphthalein
Endpoint colour change: colorless to pale pink
Table 1: Volume of Potassium Hydroxide Required
Burette reading (mL)
Trial 1
29.28
1.78
Trial 3
43.98
16.62
Trial 2
36.62
Final reading
Initial reading
Volume of KOH used (mL)
Average of 2 closest values to within 0.10 mL:
9.28
Questions
1. Complete Table 1 above.
Transcribed Image Text:A student used 9.925 x 10-2 mol/L hydrobromic acid to standardize an aqueous solution of potassium hydroxide and obtained the following titration data using phenolphthalein as an indicator: Concentration of HBr used: 9.925 x 10-2 mol/L Volume of HBr used: 25.00 mL Indicator: phenolphthalein Endpoint colour change: colorless to pale pink Table 1: Volume of Potassium Hydroxide Required Burette reading (mL) Trial 1 29.28 1.78 Trial 3 43.98 16.62 Trial 2 36.62 Final reading Initial reading Volume of KOH used (mL) Average of 2 closest values to within 0.10 mL: 9.28 Questions 1. Complete Table 1 above.
2. Write the molecular equation for the reaction that occurs between potassium hydroxide and hydrobromic acid.
3. Calculate the molar concentration, in mol/L, of the aqueous potassium hydroxide.
Transcribed Image Text:2. Write the molecular equation for the reaction that occurs between potassium hydroxide and hydrobromic acid. 3. Calculate the molar concentration, in mol/L, of the aqueous potassium hydroxide.
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