CH-1599
Planning a method
Chemistry · Secondary 4 · Medium · Planning a method
A student wants to determine the percentage by mass of water in hydrated copper(II) sulfate crystals, CuSO₄·5H₂O. Which of the following is the correct first step in the experimental method?
- Heat the crystals strongly until they turn white, then cool.
- Add water to the crystals and measure the volume of solution formed.
- Weigh an empty crucible, then add crystals and weigh again.
- Dissolve the crystals in acid and titrate with alkali.
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