Solubility & Acids: HIn, In, pH, pOH, Ksp, Ka, pH Value

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SUMMARY

The discussion centers on the concepts of solubility product constant (Ksp), acid dissociation constant (Ka), and their relationship with pH in the context of acid-base chemistry. Participants clarify that [HIn] represents the protonated form of an indicator and [In] its deprotonated form, which are crucial for understanding color changes in pH indicators. The Ksp of Ag2S, given its solubility of 1.3 * 10^-4 M at 25 degrees Celsius, is calculated to be 8.8 * 10^-12 using the appropriate Ksp equation. Additionally, the discussion highlights that H3BO3, despite having a lower Ka than HNO3, results in a higher pH due to its unique dissociation characteristics.

PREREQUISITES
  • Understanding of acid-base equilibria and the concept of pH
  • Familiarity with solubility product constant (Ksp) calculations
  • Knowledge of acid dissociation constants (Ka) and their implications
  • Basic proficiency in using ICE tables for equilibrium problems
NEXT STEPS
  • Study the calculation of Ksp using solubility data for various compounds
  • Learn about the relationship between pH, Ka, and temperature in acid-base solutions
  • Explore the different forms of acids and their dissociation constants (e.g., H3BO3's multiple Ka values)
  • Investigate the role of indicators in pH measurement and their color change properties
USEFUL FOR

Chemistry students, educators, and professionals in analytical chemistry who are looking to deepen their understanding of acid-base equilibria, solubility principles, and the practical applications of Ksp and Ka in laboratory settings.

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what does [HIn] and [In] stand for? what are the importance of them? are they the concentrations of H and OH? or pH and pOH?

another Q: the compound Ag2S has solubility of 1.3 * 10^-4M at 25 degrees celsius. what is the ksp? i tried using the ICE table, but the answer i got was wrong. the correct answer is 8.8 * 10^-12 but i have no idea how to get that answer..


also, would u look at the Ka of an acid to find the highest pH value? the Q asks: the 1.0M acidic solution with highest pH value is...
-H2S
-HNO2
-HNO3
-H3BO3 << that's the correct answer, but i thought it would be HNO3 as it has a higher Ka value and is a stronger pH..


-how does pH relate to Ka, temperature and the strength of an acid?
 
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another Q: the compound Ag2S has solubility of 1.3 * 10^-4M at 25 degrees celsius. what is the ksp? i tried using the ICE table, but the answer i got was wrong. the correct answer is 8.8 * 10^-12 but i have no idea how to get that answer..

start out by writing the ksp equation for us, that way you get to show some work

also, would u look at the Ka of an acid to find the highest pH value? the Q asks: the 1.0M acidic solution with highest pH value is...

H3BO3 has three protons, consider ka1, ka2, ka3


-how does pH relate to Ka, temperature and the strength of an acid?
this is a pretty general question you should be able to find explicit answers by reading your text.
 
what does [HIn] and [In] stand for?

In pH context In usually stands for Indicator - and HIn is its protonated form. Both forms differ in color (that's why indicator is... indicator).
 

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