Find the [Ca²⁺] in the sample (both unknown and CaCO₃) using the calibration equation. Using these concentrations and the measured pH of the sample/solutions, calculate the Ksp of CaCO₃ (see page 47 of the lab manual) for both sample solutions. Show all calculations.

[Ca²⁺] in CaCO₃ pure (2732-3749/319.3 = 7.385 ppm
[Ca²⁺] in unknown (2069-374)/319.3 = 5.308 ppm

Uncertainty in both X = 0.407 due to small y against ybar
Measured pH = 7.17, 8.11
Ksp of CaCO₃ in pure CaCO₃: Ca²⁺ + CO₃²⁻ -> [CaCO₃] Ksp