The sulfates of the Group 2 elements vary in solubility down Group 2. Give the names of two solutions that could be mixed to form barium sulfate. ...................................................................................................................................
Exam No：9701_w20_qp_42 Year：2020 Question No：3(b)(i)
Answer:
soluble barium salt AND soluble sulfate [1]
Knowledge points:
27.1.2 describe and explain qualitatively the variation in solubility and of enthalpy change of solution, $H^{⦵} $ , of the sol hydroxides and sulfates in terms of relative magnitudes of the enthalpy change of hydration and the lattice energy
Solution:
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