Experiment: How Hard is Your Tap Water?

Students use conductometric titration and gravimetry to determine how much calcium carbonate is in a sample of tap water.

This lab is an introduction to methodological comparisons. Percent error is calculated for both gravimetry and titration. Samples of tap water from various locales are concentrated and analyzed for calcium content.

Student Files

Teacher Files

Standards Correlations

Featured Equipment

  • Wireless Drop Counter
    • Use the new Wireless Drop Counter for more efficient and accurate titration data. Conducting a titration has never been easier!
  • Wireless Conductivity Sensor
    • This waterproof sensor connects via Bluetooth® to measure both conductivity (ionic content in solution) and total dissolved solids.

This experiment can also be run with previous versions of PASCO sensors.


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    What we find important to a successful implementation and adoption by teachers is showing that the probes are not a ‘standalone technology’. The datalogging activities are very cross-curricular and can incorporate math, english, science, and geography outcomes.

    We are excited to learn more about PASCO’s new weather sensor because our students enjoy projects where they can share and compare their data with weather stations from around the world and be part of a global community.

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