Is this the right way to approach solubility problem?

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SUMMARY

The discussion centers on the solubility of lead carbonate (PbCO3) and its dependence on pH levels, particularly in tap water with a pH around 7. The solubility product constant (Ksp) for PbCO3 is established as 1.8166 x 10^-7 M. It is emphasized that the presence of carbonates in tap water primarily exists as bicarbonate ions (HCO3-), which significantly affects the solubility calculations. The question posed regarding the correctness of the approach and values used in the calculations indicates a need for clarity on the application of Ksp in solubility problems.

PREREQUISITES
  • Understanding of solubility product constants (Ksp)
  • Knowledge of pH and its effect on solubility
  • Familiarity with carbonate chemistry
  • Basic principles of aqueous equilibria
NEXT STEPS
  • Research the impact of pH on carbonate solubility
  • Study the calculation methods for solubility product constants (Ksp)
  • Explore the differences between solubility and solubility product
  • Investigate the behavior of bicarbonate ions (HCO3-) in aqueous solutions
USEFUL FOR

Chemistry students, environmental scientists, and anyone involved in water quality analysis or carbonate chemistry will benefit from this discussion.

Sunwoo Bae
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Homework Statement
7. Lead(II)-carbonate deposits on surface of the water pipes. Taking into account the solubility of lead(II) carbonate calculate the mass of lead dissolved in 1 L of water pipes.
Relevant Equations
Ksp of PbCO3 = 1.8166 * 10^-7M
Is my work and the answer correct?
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If not, how should I approach this problem?

Thank you!
 
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Approach looks OK, no idea if the numbers are correct. Please note PF is not a place for checking your homework.

This is a poorly thought question in general. Solubility of carbonates strongly depends on the pH. Tap water has pH around 7, so carbonates are present mostly as HCO3- and the PbCO3 solubility would be orders of magnitude higher than the one you calculated.
 
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" Ksp of PbCO3 = 1.8166 * 10^-7M "
Is this the solubility product or the solubility? Why do you use a different value of Ksp in your solution?
 

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