SCX Chemistry · Chapter 9: Gravimetry, hydrated salts and titrations
Year 11 SCX · About 18 minutes with activities · Turn your sound on
Chapter 9 recap
- Constant mass: heat, cool, weigh, and repeat until the mass no longer changes. Precipitation gravimetry: dissolution → precipitation → filtration → washing → drying to constant mass.
- Water of crystallisation: the mass lost on heating is water. NiSO₄·6H₂O: 15.0 g → 8.84 g NiSO₄ + 6.16 g H₂O, so 41.1% water.
- n = cV (V in L); mol L⁻¹ × M = g L⁻¹. Titration: three concordant titres → n = cV → mole ratio → c = n ÷ V. DF = V(flask) ÷ V(pipette).
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