(a) State two properties of alkalis (b)(i) Why is tetraoxosulphate (VI) acid able to produce two types of salt? (ii) Write an equation for the reactior invo...
Question 1 Report
(a) State two properties of alkalis
(b)(i) Why is tetraoxosulphate (VI) acid able to produce two types of salt?
(ii) Write an equation for the reactior involved on heating sodium trioxosulphate (IV) with hydrochloric acid.
Answer Details
(a) Two properties of alkalis: they turn red litmus blue (pH greater than 7); they have a soapy/slippery feel. (They also neutralize acids to give a salt and water, and taste bitter.)
(b)(i) Tetraoxosulphate(VI) acid, H2SO4, produces two types of salt because it is dibasic: it contains two replaceable (ionizable) hydrogen atoms. When only one H is replaced by a metal it forms an acid salt (e.g. NaHSO4); when both are replaced it forms a normal salt (e.g. Na2SO4).
(ii) Heating sodium trioxosulphate(IV), Na2SO3, with hydrochloric acid:
Na2SO3(s) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + SO2(g)
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