Determination of pKa Bromocresol green

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SUMMARY

The discussion centers on calculating the pKa of Bromocresol Green using the formula pKa = pH + log10[HB]/[B]. The user has obtained a pH value of 5.17 for the undissociated form (HB) but lacks the concentrations of both the undissociated and dissociated forms of the indicator. To accurately determine the pKa, the user must obtain the concentrations of [HB] and [B] to complete the calculation.

PREREQUISITES
  • Understanding of acid-base equilibria
  • Familiarity with the Henderson-Hasselbalch equation
  • Knowledge of Bromocresol Green properties
  • Basic laboratory skills for measuring concentrations
NEXT STEPS
  • Determine the concentration of the undissociated form [HB] of Bromocresol Green
  • Measure the concentration of the dissociated form [B] of Bromocresol Green
  • Review the Henderson-Hasselbalch equation for practical applications
  • Explore methods for accurately measuring pH in solutions
USEFUL FOR

Chemistry students, laboratory researchers, and anyone involved in acid-base titration experiments or studying pKa values of indicators.

vine_shun
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i am having problem in calculating pKa
in my experiment,a formula of pKa=pH + log10 [HB]/
my data obtain only gotthe pH of HB,that is 5.17
how can i calculate the pKa??

[HB]=concentraion of undissociated form indicator
=concentration of dissociated indicator
 
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