Question

Sodium thiosulphate is prepared by

• A. reducing $Na_2SO_4$ solution with $H_2S$
• B. boiling $Na_2SO-3$ solution with S in alkaline medium
• C. neutralising $H_2S_2O_3$solution with NaOH
• D. boiling $Na_2SO_3$ solution with S in acidic medium

Answer 1

Answer: (B)

boiling $Na_2SO-3$ solution with S in alkaline medium

Answer 2

$Na2_SO_3 + S \xrightarrow[\Delta]{OH^-} Na_2S_2O_3$