Environmental Science and Engineering
GATE ES topic:principles-water-chemistry PYQs
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Questions 21–22 of 22. Imported answers require independent review unless marked reviewed.
Question 53
Open questionESNAT2 marksNeeds review
The molar concentrations (M, i.e. mol/L) of some ionic species in a water sample were estimated as follows: Na⁺ = 0.25 M; Ca²⁺ = 0.12 M; Cl⁻ = 0.32 M; HCO₃⁻ = 0.05 M. The ionic strength of this water sample is ______ M (correct up to two decimal places).
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Open questionESNAT2 marksNeeds review
Excess amount of solid calcium sulfate (CaSO₄) was added to a pure water sample (pH = 7) so that some solids remain undissolved at the equilibrium. The solubility product of CaSO₄ is 2×10⁻⁵ mol²/L². The molar concentration of SO₄²⁻ in this water sample at equilibrium will be ______ mol/L (rounded off to three decimal places).
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