A 0.17g sample of a Group 14 chloride, XCl 4, reacted with water to produce an oxide, XO2, and
HCl.
equation 1 XCl 4(s) + 2H2O(l) → XO2(s) + 4HCl (aq)
The HCl produced was absorbed in 100 cm3
of 0.10 mol dm–3 sodium hydroxide solution (an excess).
In a titration, the unreacted sodium hydroxide solution required 30.0 cm3
of 0.20 mol dm–3 hydrochloric
acid for complete neutralisation.
(a) Calculate the amount, in moles, of hydrochloric acid used in the titration to neutralise the
unreacted sodium hydroxide solution.
amount = ............................ mol
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