Level 2 Chemistry (91166) 2012 - NZQA
QUESTION ONE When dilute hydrochloric acid, HCl(aq), is added to sodium thiosulfate, Na 2 S 2 O 3 (aq), in a conical flask, the following reaction occurs: 2HCl(aq) + Na 2 S 2 O 3 (aq) → 2NaCl(aq) + SO 2 (g) + S(s) + H 2 O(ℓ) A pale yellow solid of sulfur, S(s), forms during the reaction. Over time, a cross on a piece of paper ................
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